"Optimization" apps...

Optimization

Cosmoed,
Tech Tools 4 is one program that performs optimization, but with a Mac it is not really necessary, unless you are moving huge files (movies or such). OSX automatically optimizes smaller files.
There may be some other opinions, but that is my take on it.
Good luck and I hope you are enjoying your Mac.
Kyan

 

System Optimizer X 4.7 is pretty good
Panther Cache Cleaner and its various offspring are really good too
Spring Cleaning is pretty good for longer term maintainance gets at the really useless stuff on your hard drive that is just taking up precious space...

 

There are a lot of free optimization programs. They are basically really good uses of Apple's Apple Scripting language. I like Onyx and Mac Sweeper. There are number of action scripts and free optimization scripts out there with less elegant interfaces. There are also a number of optimizers that have the same functionality with a cost attached. What Tech Tools and the higher cost optimizers offer is defragmentation , which I don't find to be a problem. They also offer advanced file and disk repair, which is a bonus. Running them off the boot disk, allows deep repairs to system structures that might not be possible when running the app from the HD.