Script Runner. This is a Launch Agent and script launcher so we can have a folder of scripts that are run anytime a user logs in. This is very barebones and not even remotely fancy, please feel free to share any feedback or suggestions you might have. Updated 2014-03-04 to support logging

org.yourorg.scriptrunner.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>org.yourorg.scriptrunner</string>
	<key>ProgramArguments</key>
	<array>
		<string>/Library/yourorg/ScriptRunner.sh</string>
	</array>
	<key>QueueDirectories</key>
	<array/>
	<key>StandardOutPath</key>
	<string>/var/log/yourorg-scriptrunner.log</string>
	<key>StandardErrorPath</key>
	<string>/var/log/yourorg-scriptrunner.log</string>
	<key>RunAtLoad</key>
	<true/>
	<key>WatchPaths</key>
	<array/>
</dict>
</plist>

ScriptRunner.sh

#!/bin/bash

# save this file at /Library/yourorg/ScriptRunner.sh

script_path="${0}"
source_path=$(dirname "${script_path}")

chmod 777 "/var/log/yourorg-scriptrunner.log"

if [ -d "${source_path}/User Login Scripts" ]; then
	cd "${source_path}/User Login Scripts"
	for item in *; do
		echo "### $(date) BEGIN ${item}"
		"./${item}"
		echo "### $(date) END   ${item}"
	done
fi

chmod 777 "/var/log/yourorg-scriptrunner.log"

exit 0