How to keep MacPorts as slim as possible?

Dear list, how do I keep my MacPorts installation as slim as possible? I know of this: Trashing inactive ports/versions after an upgrade or any time by way of

sudo port -f uninstall inactive

Now from Fink I know this

fink cleanup which is being described to "reclaim disk space used by temporary or obsolete files". Is there something similar for MacPorts?

Are there any other ways? I'd suggest to have some web site up to answer questions like this, preferably on http://www.macports.org/ . Or is it there and I simply missed it? Cheers, Thorsten.