Fixed script to work even when a terminal window isn't already open.

open_here.applescript

tell application "BBEdit" to set theFile to file of document 1
tell application "Finder" to set theFolder to (container of file theFile) as alias
set theUnixPath to POSIX path of theFolder

tell application "iTerm"
	make new terminal
	tell the first terminal
		-- launch a default shell in a new tab in the same terminal 
		launch session "Default Session"
		tell the last session
			write text "pushd  \"" & theUnixPath & "\""
			activate
		end tell
	end tell
end tell