I run a list called Word of the Unspecified Time Span (WOTUTS). Basically when I find a word that interest me, I send the word, its definition, and a sentence using the word out to the list. The recipients of the email can then use a web form to post their own sentence if they so desire.

It is hard to quantify what makes the word interesting to me. Here are some qualities I consciously know I look for: how it looks, how it sounds, its meaning (denotation and connotation), the era the word was/is used in.

You can find the non-alphabetized list of all previous words sent out at http://www.gristle.to/markup/all_defs.html