Here is a great cool tool for AutoCAD 2007 and AutoCAD 2008. The CommandComplete bonus tool.
It would be a good addition if also user defined commands where included.
Well it can be done by editing the commandcomplete.xml file. I use XML Notepad here.
Now when I add the cool command:
Command: (defun c:cool()(princ"\nCool!")(princ))
Notice also when I write the keywoard 'great' it works as well.
There are also options available if you right click.
BTW. It's free.