I'm a StackExchange employee and I'm here to improve the quality of the site. I'm editing question titles to improve their readability and just generally working to make this site even more awesome.
If I edit a question title and you don't happen to like it, or you felt it was better the way it was before, feel free to revert the question to previous version of the question -- no harm, no foul.
Otherwise, don't mind me, just doin' my job.
[EDIT] Joel Spolsky has posted more information about CHAOS Team and what we do.