<a href="http://httpd.apache.org/docs/2.2/misc/perf-tuning.html" target="_blank">http://httpd.apache.org/docs/2.2/misc/perf-tuning.html</a> for Apache
And for MySQL use mysqltuner / tuning-primer while ignoring the key_buffer_size tuning-primer may report - safe & good to use up to 1/4 of the installed RAM for key_buffer_size
Finally check your addons for anything server intensive - automatic image resizers and so on and maybe use a profiling tool for MySQL to find what your DB is doing all the time or apachetop for Apache - maybe together with mod_status (only for testing, not for production use).
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