In situations like this I miss BBEdit's multi-file search feature. In my years as a delighted TextMate user, the only times I have been tempted to fire up BBEdit is when I want to do non-trivial searches like that.
One thing I really like with TM1 is its capability to deal with several folders coming from different directory trees: there no need to create a "project" document to quickly edit files that are semantically related but that do not share the same tree.
It's not just about searching: it's also about having a project drawer that only contains the file I need to deal with, not the gazillion of files from a complete kernel, for example. It's far easier to navigate around 100 files than around dozens of thousands of files.
I'm not sure how to work with TM2 without this feature, I guess there is another, maybe better way for this feature. I just don't know which one.
Manu