Is it down for me only?
EDIT: it's back (or at least, looks like it). The traffic is being drained to a static copy of the page, so don't be surprised if comments you post on that page don't appear.
I'll be back with an actual (cache-based) solution soon, hopefully.
http://rimuhosting.com/howto/memory.jsp
Scroll down to RESOLVING: HIGH APACHE MEMORY USAGE
EDIT: I realized after I posted that simply posting two links might seem snarky. I don't mean to be. I know these links because I've been in the same spot you are. I think we all have. That's how we learn :)
I'll try to install the cache plugin as soon as I retrieve control over my server.
http://www.cherokee-project.com/
as close as you'll get to Zeus Web Server for free.