When I was younger I donated 7 or 8 pints of A+. Then I was diagnosed with end-stage renal disease and forbidden to donate. I received a cadaveric kidney transplant nearly 10 years ago during which I received a pint or two back. Unfortunately, the immunosupressant drugs still make me unable to donate - want to, but they won't take it for fear of what any un-metabolized immune suppressant compounds might do to the recipient.
My wife is AB- and as you might expect is in high demand. She gives as often as she can but often is excluded due to being borderline on a number of the measurements. That, and she's fainted numerous times.
Thanks to whoever donated the blood for my operation, and thanks, too, for all of you who have signed your organ donation card!