Ok, I've got PHP5 and mySQL 5 running on the server and the sites being served use PHP and mySQL a fair bit.
I want to be able to have Apache configured so that I can get as many users as possible out of it without it falling over.
Heres a screenshot from the 'top' command of Unix on the server to give you an idea of memory states, as far I know, the VPS server itself has 4Gb RAM, but I'm not sure how much of that I have accessible on my VPS package. Its running FreeBSD 6, so I'm guessing it'll have 256Mb or 512Mb RAM allocated to it.
Jason