+1
Show top function's prototype in autocomplete window
So when implementing a function, you won't have to switch to a different file and back if you forget what parameters the function accepts.
Customer support service by UserEcho
Some examples of how this should be done with a tooltip type window:
Well, kind of but I was thinking a little more unobtrusively built into Sublime Text's autocomplete drop-downs. More like the second image above with messagebox(.
This should be merged with: http://sublimetext.userecho.com/topic/20812-add-intellisense-like-support/