Interesting that a couple of people would like to see a record of their given rep. So would I, but as that's not available, I keep a record of it myself (date, recipient, post, positive/negative (nearly always positive), my rep comment). Yes, I'm pretty damn anal.
I've got a record of my thousands of text messages from the last few years too.
So I can say I've given rep 33 times. Not much, probably because it's a pain in the arse to give it when you have to record it manually! Also, I only noticed the rep thing in mid-2007, a couple of years after I joined AppleNova. I've mostly given rep for witty posts, insightful commentary in AppleOutsider, and posts that have helped me with a technical issue, usually in the Genius Bar.
Would be nice to see a complete record of received rep too. Is that held on record somewhere in the bowels of AN?