I just completed my donation on July 9th. I'm recovering well, and still very glad I did this for my brother. But, the way organ donation is run (at least at Stanford where I donated) is awful. Like other people have said, the people at the donation center make it out to be "no big deal". When I questioned if my blood pressure was in the correct range, one nephrologist told me, "We will do the donation, not matter how high your blood pressure is, if you're really motivated to help your loved one". That kind of crap left a bad taste in my mouth.
But, so far, I would do it again, even knowing what I know now (we'll see what I'm saying in 20 years though!).
One thing I would do differently though... I would have gotten a 2nd opinion! If I would have come across this website a few weeks earlier (where I've read several times that you should get a 2nd opinion) I would definitely have done it!
Agh, one other thing! Please, if you're reading this, and are even THINKING about donating ANYTHING, go get life insurance before even talking to anyone at the donation center! Otherwise, you are out of luck.