For links to foundries, try these links...

http://www.typo.cz/_pismo/pis-dig-odkazy-al.html
http://www.typo.cz/_pismo/pis-dig-odkazy-mz.html

You can also use these online shops:

http://www.myfonts.com/
http://www.fonts.com/
http://www.fontshop.com
http://www.philsfonts.com/
http://www.veer.com/
http://www.fonthaus.com/
http://www.faces.co.uk
http://www.type.co.uk/
http://www.paratype.com
http://www.fontfactory.com/
http://vllg.com/
http://www.typetrust.com/
http://www.fontmarketplace.com/
http://www.graphicobsession.fr/index.jsp?media=type

You're in for a long slog. There is simply so much out there that it's better to start by describing what you want, such as: "I need

• a sturdy, rugged serif for newspaper text"
• a casual, friendly script with a nod to the American fifities."
• heavy sans serif typefaces that look like they were hand drawn with a pen or brush."

With more specific requirements we can be much more helpful with recommendations.

Thank you for the links loremipsum, very helpful!

I suppose specifically I'm looking for a more elegant, humanist serif typeface. I'm going to be creating brand guidelines for a fairly high-end party planner, so I'm looking for some quality 'old-fashioned' typefaces that can still look contemporary enough.

I think I have something that might meet the description, but it's not ready yet.

> elegant, humanist serif typeface. quality ’old-fashioned’ typefaces that can still look contemporary enough.

Now we're talkin'.

Borgues
FF Maiola
MVB Verdigris
Farnham
Delicato
Galliard
Swift
Fresco
Freight
Eason
Le Monde
Brioso
Relato
Lineare
Dolly
Prensa

Thanks Stephen! Looked through them all. The list was super helpful. For some reason, I like Eason... but I may have to take another look later today.

And Whitman is nice - and according to the designer, Kent Lew, more weights, including display weights, are soon to be released.