Oops, now it's down again. Service httpd not running ...

Here's my memory usage. Any ideas? It seems i have to buy more RAM again?

Not to be flip, but I switched to Lighttpd and SQLite for all my web apps. For wordpress, you can hack in SQLite support with http://rathercurious.net/pdo-for-wordpress - I had to manually create tables for a couple WP plugins, but it was worth the effort because I'm seeing a lot better response from my lil Linode 360.

hehe. not to be even more flip, but i dropped wordpress all together and wrote my own lite blogging engine! (if you're curious: http://dertyn.com )

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you seem to be using way too much memory for what you're doing
did you look "ps aux" of what's going on on your box and what programs exactly are using the memory ?

also, if you don't want to completely replace apache you can consider using nginx as a reverse proxy and have it serve the static pages while you'd keep apache for just the PHP pages.