I created a poll on the wiki to get a feel for which languages TextMate is primarily used with:
http://macromates.com/wiki/Polls/WhichLanguageDoYouUse
Cast as few votes as possible, i.e. do not add points to languages you rarely use (it is not a poll about how many languages people know, but which they actually use regularly).
Be vary of edit conflicts on the wiki page. These will be detected automatically, but needs manual resolving -- it is probably easier to just start over, if one happens (the wiki presents the diff when committing the edit when there is a conflict).
I think queuing theory dictates that some edit conflicts are bound to happen, given the number of subscribers to this list, but I am not writing specific polling functionality just for this :)