Font Research/Testing/Learning!

Fonts by Style -- Style Index
Fonts by Theme -- Theme Index
Fonts by Use -- Use Index

What font is that?
upload an image or submit url to find out

Interactive typographic primer

http://www.rsub.com/typographic/
Basics of typography
http://designinstruct.com/tools-basics/the-basics-of-typography/

fonts:

http://new.myfonts.com/

http://www.fontshop.com/fonts/

http://www.fontscape.com/

more fonts:

http://www.abstractfonts.com/
http://www.dafont.com/
http://www.miniml.com/

Typomania!!!

http://www.youtube.com/watch?v=_lfE3Q4kiSE

Create your own

http://fontstruct.fontshop.com/

Interesting russian site -- show pre-work to design of font

http://www.dailytype.ru/

Links below are excellent sources for inspiration/research

http://typographica.org/

http://typophile.com/

http://www.chronotext.org/
http://typebase.com/ 
http://www.typotheque.com/article
http://www.typeforyou.org 
http://ilovetypography.com/