Before considering building my own, I’m looking for php/mysql implentations of Yahoo Answers. So far, the best examples is Askeet built by the symfony Web PHP Framework. I’m going to give it a try, but always looking for alternatives.

Cloaked or disguised agents can mimic Google, MSN, Yahoo, and Ask… so here’s a way to verify if they are actually who they say they are. Reverse and forward DNS lookup warning.