A vast collection of source sites and resources on the Classical world, including Greek and Latin texts. They're even working on a translation of Harry Potter into Greek - maybe they can send JK Rowling some correct Latin terms instead of the mangled gibberish she puts in the books...
An excellent collection of English translations of Greek and Latin texts. You'll also find some great biographical information on the authors that students can use to improve their source evaluations (if you teach in a system which requires that - it's massive here in Queensland).
This will only excite other Latinists out there. A very extensive collection of Latin sources from most regions in Europe. Bibliotheca Augustana multa bona magistris Latinae est!