I used Apache earlier, but on Linode and other environments with more limited resources Lighttpd is my choice. I found it easy to configure and it seems a great performer to me though I haven't tried nginx yet.

apache 2, php 5, mysql 5 on a Linode 360.

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I use nginx as frontend to serve static files and proxy requests to apache+mod_php, as backend to php files.

Lighty here. Been a convert since, on my first Linux machine ever (a Cyrix at 200MHz), apache ran the machine out of memory and started killing things.

apache here, no really reason to use lighttpd since memory isn't a problem.
with lighttpd you save few memory and IMHO doesn't worth the chance.