Well, the first thing that attracted me to Eligius is the lack of registration required. I don't want to have yet another password (since it would be foolish to re-use passwords).
+1 I use a pool with receiving address as the username as well
it's multiclone so I'm getting more than 1.0 utility for my shares theoretically
my backup pool is is mineco.in because it has no fees and pays out transaction fees to pool members