A list of serifed "fonts that perform adequately at text sizes in the harshest rendering mode that is still common: Windows XP with ClearType off"
@font-face
The Great Typekit Table
The folks at Sleepover have compiled a sortable list of Typekit-powered fonts that meet two key guidelines: "first, the font had to have lower case, upper case, bold, italic, and bold italic; second, the font couldn’t be handwriting, script, or monospace."