Apache/MySQL Server Optimization

We currently have a server with a Magento install that is receiving approximately 3000 unique visitors a day, 100,000 pageviews a month. We have a basic Apache/MySQL configurational- all sharing a single server that is equipped with 4GB of ram. We need to optimize both Apache and MySQL for better speeds and to properly use the RAM available to us. We need the settings for both setup to properly allocate the ram- we need to be sure we dont run our of ram, but at the same time, we need to use as much of it as possible to get good speeds Some misc details: Our server is a linode. Our magento install uses a full page cache extension for speed. Our server is running Apache2 on Centos 5.5- 32-bit. Also, ideally this person would setup log rotate for apache and mysql to better manage our mysql logs- currently they are using a large amount of disk space and we need them rotated properly.