I've migrated my teeny-weenie Xen web/mail server to Debian/etch. It hasn't even been rebooted (it would be a shame to spoil the uptime :-) ):
It runs Lighttpd, a small and fast little webserver, popular in the Rails world. Lighttpd with PHP-fastcgi is probably faster than apache, and uses much less RAM.
With etch, I've finally been able to get mod_rewrite to work. So my Zapiro archive has nice URLs now :-)
Lighttpd has a very nice configuration style:
It's more logical than apache, but you have to watch out for rewrite->redirect->rewrite loops. So if you change to a clean URL syntax, you can't put in rewrites from
/uglyurl rewrites back to
/index.php?/uglyurl, and you get a loop :-)