[Kevin Sevcik]

I've no links to offer, but a comment on those brandsoftheworld links. The super shiny looking logos are almost certainly useless for t-shirt design unless you're making a transfer. I'd go with the flat looking single color ones. Also, even if you get the logos from other sources, I'd still keep after your probable sponsor contact. Companies have very specific rules about the use of their logos, down to what pantone colors you're supposed to use for them. He's your best option for getting with the PR people that can tell you all that.