I was going to do the top 5, but it was a tie.  Ditto 10. So... top 
fifteen domains, out of the 342 unique subscriber addresses.  I was 
thinking we'd lost all our Yahoo subscribers, due to the pretty serious 
reliability issues Yahoo has, but I think many just double-subscribe.

gmail.com: 58 (17%)
yahoo.com: 37 (11%)
comcast.net: 9
hotmail.com: 7
cox.net: 5
earthlink.net: 5
aol.com: 4
bellsouth.net: 4
phoenyx.net: 4
sbcglobal.net: 3
rogers.com: 3
msn.com: 3
io.com: 3
excite.com: 3
mac.com: 3

The thing I find interesting is the number of vanity domains among Phoenyx 
subscribers. I'm wondering if that's common, or if mailing lists these 
days tend to be limited to the sort of person who is likely to run their 
own domain.