I've gotten (and given) a few tips before. I don't make a big deal of asking for them---I just figure if someone wants to send me money for whatever reason, I may as well make it easy for them.

good question - no, i've never got any, but i'm still quite new.

I never have, no.  On first thought, that might seem kinda strange, since I've dispensed lots and lots of very useful advice in various threads.  Then again, I'm an arrogant prick, and I think people can tell, so maybe it isn't so strange after all.

I have not gotten any donations to myself.  There was a .01btc donation to my btcdish (like a penny dish at cash register). I have put a few bitcents in it, and instawallet admin accidentaly put 6btc into it, some random person took it, and has not returned it to my knowledge.

I have made a few bitcoins off my referral links.  I have them all listed on one page, too many to list in my sig.  Most profitable are bitcoinbonus, and sldoubler.