iirc, perlbal is a reverse proxy. i've been advised not to use it (can't comment beyond that - ymmv).

i found this post because i'm trying to figure out whether i should stick with starman or switch to twiggy. as i'm using anyevent in my psgi but i don't think this will be my main use case. also, i've always liked preforking web servers.

my recommendation at this point would be to look at starman. if you need any advanced features (ssl, load balancing, content caching, etc) to check out nginx.