I highly recommend the site. It currently contains scans from Smith’s monumental work on Greek and Roman Antiquities and much more. There’s also a new Wiki Classical Dictionary which could benefit from the input of some of our readers (hint).
You can find the link above or in section 4 (Reference) of the Cheat Sheet.
PS: I’ve fixed the links to the Romance and German dictionaries as well.
PPS: I’ve also just added a number of online dictionaries including the Monier-Williams Sanskrit Lexicon.