Glenn Reynolds writes a little about giving blood and even posts a picture. I always give blood when the bus comes by work; sometimes I'll go two or three times a day just for the cookies, but they start to get suspicious after a while. So I recommened buying a wig.
Mr. Reynolds also mentions:
One interesting observation: This is the first time I've donated on campus where there were more men than women giving. Usually it's quite lopsided in the other direction. One of the techs there told me that it's been that way this year; no idea why.The first potential explanation that came to my mind -- possibly particularly apt on a college campus -- is that the young men who aren't fighting abroad are keen to make some small contribution.