Stephen Coles at Typographica.org writes:
"Most fonts are licensed when needed, selected specifically for the job at hand.
But when my (less font-addicted) friends are seeking versatile, workhorse typefaces for future use, I send them this list.
These sites offer most of the best fonts available, and — crucially — present them well, too.
The focus here is on downloadable desktop fonts for print use, but some of these shops offer webfont versions as well. For now, my webfont-specific shortlist is simply: Typekit, Webtype, Fontdeck."
Check out this great curated list of Font Sources (12 foundries included): http://typographica.org/2011/on-typography/my-favorite-font-sources-a-shortlist-of-trusted-foundries-and-retailers/