When I listen to my personal radio, I find that because of the diversity *cough* of my profile tracks, the playlist becomes a mishmash and not that great. I've started tagging the songs now so hopefully I will be able to play tag radios and cut down on the choppy selections.
In the mean time, I've noticed that I can go to personal radios of people who have more consistent taste and get a better stream of stuff than I get from my own. So thank you friends!