you might be able to save yourself a little memory from apache by unloading any DSO's you are not using.
Apache by default loads quite a few modules you might never use, look @
http://httpd.apache.org/docs/mod/
and read about each module, and determine if you need it, also try the following:
http://httpd.apache.org/docs/misc/perf-tuning.html
http://httpd.apache.org/docs/misc/perf.html#Linux