I am DONE!! (for now, at least). I started mining on an ATI 5450 at 15mhs. I then added 3 more video cards and a couple of jalapeno preorders, then I added a handful of BE and red furies, for a total of 50 ghs.
Now I am watching my daily total fall to under .01 per day. It is depressing.

Sometimes I feel like I need to go back to playing warcraft. At least then when you got ganked you had someone to blame. But all in all, it's been very educational, and I am happy with the bitcoins I have earned. Sometimes I look at the hashing power I have now, and think if I had it 2 years ago, I would be a millionaire, but now it;s just sad to see the scraps I resign myself to making.
All in all, I have broken about even (not counting any residual value of the miners themselves), maybe ahead 1/2 coin or so at best. I think the learning was worth it, so I don;t feel cheated, just sad that there is no longer room for the little guys to be "productive"
I will probably get rid of my stuff before the summer, when the waste heat will be an added expense instead of a help to heat the house (I am in Michigan)
I can always come back in with more capable hardware at a later time, when the hash to $$$ ratio and the difficulty rises are less steep