Found a bunch of very informative and simply written articles about HPV and STDs here: http://www.womentowomen.com
The site appears to be for a women's health center in Maine. They do try and sell a hormone balancing program at the very end of some articles, but I found the info they provide to be very comprehensive, clear, and easy to understand.
Here are a few I've read so far:
Abnormal Pap smears and HPV
Safe sex in midlife
STD signs, symptoms and testing