yup myfonts is the best source of paid for fonts I have found.
for free fonts the
Download fonts | dafont.com is the easiest source but some are low quality although for web graphics most are fine.
Just remember that for body text which can be found by search engines, then use fonts which are available on most platforms. That means MS core fonts such as Verdana, and Times etc. These are also standard on Macs. The list of these are very very limited.
for fonts embeded in graphics then the choice is unlimited.
For some different fonts, take a look at
Fontcraft's Scriptorium Fonts and Graphic Arts
some are free some are paid for.