While I love my Geeklets, I had a pretty hard time to set them up consistently across varying monitor setups (home, work, on the go,...). The bad news first: There is no built in mechanism (as of 01/2013) to take care of this problem. Still there are good news: With some minor tinkering, you can automagically position your Geeklets across multiple setups.
The initial step is to add your Geeklets - you can totally ignore the positioning for the moment.
Once this is done, let's start with some simple scripts. With the help of AppleScript (I created .app files for this), you can position your Geeklets wherever you want. This means you'll need to create one script for each setup. However, I found the manipulation via a script more convenient than dragging Geeklets around by mouse, but GUI centric users might disagree. So let's get started: First, fire up the AppleScript Editor and run the following code to fetch the IDs of all the Geeklets you've added so far:
tell application "GeekTool Helper"
geeklets
end tell
This should return a result similar to this one:
{shell geeklet id "77946042-43FA-42CF-891B-624912269D25" of application "GeekTool Helper", shell geeklet id "E94270E2-35BB-42B1-B0F1-E464DE988940" of application "GeekTool Helper", shell geeklet id "C834BEE8-670D-4C77-BA15-D1388B32FF80" of application "GeekTool Helper", shell geeklet id "0B44BD7D-E6BA-45C1-A794-C54D35DEE605" of application "GeekTool Helper", image geeklet id "CC56DB0D-92FB-4D9A-848A-F131FB3DFB5D" of application "GeekTool Helper", shell geeklet id "3AA07D2C-F41A-42C2-8D99-5CF17E5EFD2A" of application "GeekTool Helper", shell geeklet id "CD1A2CEE-AEDF-4932-BB6A-957D03FF8752" of application "GeekTool Helper", image geeklet id "5FCF08C3-C73F-4BA9-A963-E5DAA25D1653" of application "GeekTool Helper", shell geeklet id "416A2E4A-5E10-416F-AE93-2AF041CB5B02" of application "GeekTool Helper"}
You might want to save our first script, as it comes in handy whenever you add or remove Geeklets.
Now it's time to get started with the positioning. What we are doing now is to use the IDs from the previous step to position them. Positioning means setting an x and y pixel value - which will look something like this:
tell application "GeekTool Helper"
# Date
set x position of geeklet id "77946042-43FA-42CF-891B-624912269D25" to 7.0
set y position of geeklet id "77946042-43FA-42CF-891B-624912269D25" to 500.0
# Itunes visualisation
set x position of geeklet id "E94270E2-35BB-42B1-B0F1-E464DE988940" to 660.0
set y position of geeklet id "E94270E2-35BB-42B1-B0F1-E464DE988940" to 730.0
# Calendar
set x position of geeklet id "C834BEE8-670D-4C77-BA15-D1388B32FF80" to 7.0
set y position of geeklet id "C834BEE8-670D-4C77-BA15-D1388B32FF80" to 30.0
# Itunes title
set x position of geeklet id "0B44BD7D-E6BA-45C1-A794-C54D35DEE605" to 513.0
set y position of geeklet id "0B44BD7D-E6BA-45C1-A794-C54D35DEE605" to 710.0
# Weather icon today
set x position of geeklet id "CC56DB0D-92FB-4D9A-848A-F131FB3DFB5D" to 850.0
set y position of geeklet id "CC56DB0D-92FB-4D9A-848A-F131FB3DFB5D" to 50.0
# Weather temperature today
set x position of geeklet id "3AA07D2C-F41A-42C2-8D99-5CF17E5EFD2A" to 850.0
set y position of geeklet id "3AA07D2C-F41A-42C2-8D99-5CF17E5EFD2A" to 35.0
# Weather lowest temperature tomorrow
set x position of geeklet id "CD1A2CEE-AEDF-4932-BB6A-957D03FF8752" to 1027.0
set y position of geeklet id "CD1A2CEE-AEDF-4932-BB6A-957D03FF8752" to 55.0
# Weather icon tomorrow
set x position of geeklet id "5FCF08C3-C73F-4BA9-A963-E5DAA25D1653" to 990.0
set y position of geeklet id "5FCF08C3-C73F-4BA9-A963-E5DAA25D1653" to 50.0
# Weather highest temperature tomorrow
set x position of geeklet id "416A2E4A-5E10-416F-AE93-2AF041CB5B02" to 1027.0
set y position of geeklet id "416A2E4A-5E10-416F-AE93-2AF041CB5B02" to 40.0
#
#set x position of geeklet id "" to 0.0
#set y position of geeklet id "" to 0.0
end tell
Tip: How do you even know there is an option "x position" and what other possibilities do you have? Open AppleScript editor's library (command+shift+L). In Finder open the GeekTool.app ("Show package contents" in the context menu). Open Contents/PlugIns and open GeekTool.prefPane (again with "Show package contents"). In Contens/Resources you should find the "GeekTool Helper.app". Drag it onto the script editor's library window and you can then look up all available features.
This is my "on the go" setup, which I've saved under an appropriate name. So every time I run this little app, it will position my Geeklets on my laptop's screen. You'll need to create similar scripts for all your different setups.
Note: A different approach would be to use multiple groups and enable / disable them as needed. However, with multiple groups you'd need to duplicate the Geeklets for each setup, making it awkward to change them. I find the positioning approach much nicer, but you could also try the group one.
While this is already pretty nice, it's not automagical. To get this done you'll need a third party app, which is aware of your current location. My tool of choice is ControlPlane (http://controlplane.dustinrue.com), which is based on MarcoPolo (http://www.symonds.id.au/marcopolo/ - no longer maintained). Now I've created a location based on different monitor setups - which is really the difference we're interested in. As there is no negation at the moment, I've created a rule for "on the go" without any additional monitors with a pretty low priority. As soon as a specific screen is plugged into the laptop, a rule for this is fired with a higher priority. This should detect the correct monitor setup currently in use. The final step is to automatically execute the correct script based on the current location.
That's it - now you can have an automagical Geeklet configuration, which isn't too hard to create.
I'd like to try duplication. How do I duplicate a geeklet using the command line?