coopster - 3:15 pm on Feb 3, 2011 (gmt 0)
Nobody seems to be using nGinX ... except you :)
What did you discover?
On the other hand, Apache + XCache [xcache.lighttpd.net] has been a popular choice for some regarding performance issues. I've not found Apache to be the bottleneck so much as it is the fat apps like PEAR, PECL, WordPress, etc. that can bring a server to it's knees sometimes.