I listen to Word of Mouth which, as its name implies, is a programme all about the spoken word (there's a "Listen Again" link as well, so you can listen to the actual broadcast). Among other subjects, they mentioned The Grandiloquent Dictionary. This lists some really strange words. Enjoy .
Tinman, I don't think that is altogether fair as it is being billed as a specialty dictionary.
However, I just posted a thread about truthiness (it's too new to be able to link to at this point; it's in Q&A), and that word sometimes applies to the Grandiloquent Dictionary. That is, if you take the words seriously, you must verify them with a reliable source (not something like Mrs. Byrne's Dictionary) because it isn't always accurate, as we've said here before.