optimizing memory?

what is a good download that clears memory and frees up space, gets rid of all the junk, and does virus scans and system scans? stuff like that.

thanks
miatch

hmmm, i want to know too...
but i think this is only in PC, please correct me if i'm wrong (i'm new in the Macworld).

i think your refering to a windows registry which would need cleaning up......

if you are looking to clean up your cache, run maintenance, then i recommend main menu... http://www.santasw.com/ It will not only run maintenance, but it will also resolve any permission issues with your hard drive

yeah and OnyX.