system optimization: tool collections?

I got lots of small tuning, tweaking and just generally "cleaning up" tools on my system but am looking for a software bundle of sorts now, so there'll be less clutter on my drive than right now

what are you guys using?
a tool collection for all sorts of system optimization tasks would be great, doesn't necessarily have to be freeware but that would be nice, of course :D

Uh, there's norton systemworks for example.
It's got lots of system optimization tools (duh) in there (even for hardware checkups and stuff) but what makes it interesting IMO is that antivirus software is included (a full version or NAV), so it's cheaper than buying av and some sort of system tools bundle separately, I guess.