Okay, I deleted my ~/Library/Application\ Support/TextMate/ and got the same behavior that Jon and Paul are reporting. The issue seems to be that for some reason 1.1b3 isn't recognizing its internal bundles. Here is a hacky little fix if you can't wait for Allan to wake up in 6 hours. :)
cp -r /Applications/TextMate/TextMate.app/Contents/Resources/Bundles ~/Library/Application\ Support/TextMate/
All that does is copy the Bundles directory from the Program package into the user bundle area. Not a very nice hack, but it's better than nothing.
oh... I read the mail from Jon giving another version of this fix: if you open the tmbundle's, they will install themselves in the user area, another version of this same kludge. As I remember, that will produce a zillion little confirm windows... I like my shell way better! :)
best wishes, Eric