LaunchBar has a convenient Skype dialer script, based on this hint from a few years ago, which takes a phone number and dials it in Skype. The following script takes a phone number and creates a chat window in iChat for SMS use. It only works for US numbers. Some of the code was taken from an AppleScript elsewhere on macosxhints.com.
Here's the code:
Comments (0)
Mac OS X Hints
http://hints.macworld.com/article.php?story=20090324205722112