We get attacks quite frequently but most are easily negated and we generally don't announce them to avoid giving credit or antagonizing people who may be responsible. When nothing is affected they usually stop after a few hours and move on. I believe a lot of people think we run everything from a single server or a VPS and think it would be easy to bring us down. A likely cause is the amount of people we suspend on a daily basis for breaking the rules, mostly for warez.
I'd say maybe one every few months actually causes an issue if that, someone has to have a fairly large botnet to take one of the servers out and generally we can recover quickly.
To ltmoon: I'm sick of your attitude around the forums, I could care less whether you believe us or not. If I continue to see this negative attitude from you, I will re-evaluate the relationship and you won't be here anymore.
-Corey