I got a free credit score at a mortgage site just for grins. I thought that perhaps with all of my credit card arbitrage my score would be lower. Well, despite having never taken out an automobile or house loan, I had a score of 760. According to a second website I found 700+ is excellent credit and 770+ is A+ credit. I'm sure with a few more years of Discover and Citicard under my belt my credit will only improve.
The only thing I can figure out is that by borrowing so much money and paying it back without any late payments must make my score up despite the fact that I cycled through a fair number of cards.