SantaSoftware has released MainMenu. The blurb on the homepage reads:

Don't have time to run all the various tools and scripts to keep your Mac running smoothly? MainMenu makes these tasks quick and easy, right from your menu bar.

Rebuilding your Spotlight library for faster searching, repairing permissions, cleaning caches to improve application performance, and even more advanced settings — such as enabling and disabling the Dashboard — are no more than two clicks away.

MainMenu is full of powerful maintenance tools to keep your Mac running like new, within a slick, simple interface.

It doesn't do anything that can't already be achieved using freeware utilities, but it does bring a lot of useful functions under one easy-to-find/easy-to-navigate menu. I've been using it for a while now, and it does all the above functions, along with a number of others that I usually have to use a separate utility for, including 'force empty trash'.

And it is free. Thank you Santa Software for my early Christmas present.