I actually didn't know about that one, thanks.

I used ShellHere, but I see this page has some additional information for tabs: http://maururu.net/2007/enhanced-open-terminal-here-for-leop...

for the do it yourself types:

1. open AppleScript Editor

2. put this script in it:

  tell application "Terminal"
  	activate
	do script ""
  end tell

3. Save as an Application (probably in your Application folder)

4. (optional) replace the icon by ctrl-clicking the new Application and selecting "Show Package Contents". Navigate to Contents >> Resources and change the applet.icns to something more pleasing. Maybe copy the actual terminal icon.

5. put this icon in your doc and always get a new window when clicking it.