Interesting to see that most of them are almost always growing. It would be interesting to compare them to some other metrics, such as TODO/lines_of_code or TODO/num_contributors, to compare the TODO's with the size of the project. I guess that as project gets bigger, it also gets more TODO's
At least this is needed for any meaningful comparison between project (or even in projects themselves, as some double in SLOC count over a few months)