Regarding whether these types of utilities do any good, the answer is, it depends.

VOTE: CCleaner, for reasons mentioned before.

I'll join the mob recommending robocopy. Back in the bad old days before DFS, I would use it to move the entire contents of file servers to new servers. Today I use it to copy large files between computers over flaky WAN connections. When I use the /z option, if the connection drops, it just waits a few seconds and…

I've been using JK-Defrag for nearly a year and I've been happy with it. I'll give this app a look though, because it sounds like it may give finer control.