Ok, I now have it working with functions as well as tags.
put your cursor on a tag/function and hit a keystroke and it pulls up the appropriate livedoc entry, also prompts you if you select nothing or leave your cursor on nothing while hitting the keystroke. If anyone wants to give it a try I have attached the text file.
To add it in (you don't have to add it to the CF bundle)
#1 copy the contents of the file
#2 load textmate and then select bunde > bundle editor > show bundle editor (ctrl option cmd B)
#3 create a new command (you can just click on your bundle name and add it there)
settings for the new command: Save: Nothing, command(s): Paste code here, Input: None, Output: Show as HTML, Key Equivilent (I chose option, cmd L), scope selector: text, html, cfm
#4 Bundles > Bundle Editor > Reload Bundles
voila, lookup should be working.
-Steven