Here's the current version of nnir.el.  It allows you to index, then
search your mail with Glimpse, or with freeWAIS-sf, or with Excite for
Web Servers, or with IMAP.

You must be using the nnimap backend (for searching with IMAP), or the
nnml or nnmh backend (for searching with one of the other programs).

Let me know what you think.

kai
-- 
I like _b_o_t_h kinds of music.