Rare Data Archive
Material written by other people which is worthy of consideration IMHO.
Table of contents:
How to Bring a Language to Life
Kalaba-X, the conlang that teaches the art of translation
Jigwa, a rough draft conlang that was never completed
alt.binaries.world-languages newsgroup FAQ
info on the DLT machine translation project
bits of humor from Conlang-list
Links to Resources