While looking for Latin e-texts I stumbled upon a Gutenberg.org-edition of Döderlein's Hand-book of Latin Synonymes. I always thought that an e-text-version of a book of Latin-synonymes would be good. Thank god I did not embark upon a respective transcription-project. Choosing Döderlein was not a bad decision either. The html-version of this e-text is extremely well done. The only thing missing, at least in my opinion, is a well-prepared pdf-version with all the hyperlinks fully functioning.
Grab it, it's a must have.