Strip-Down the OS for Speed?

I'm learning as much about my Mac as possible, and now want to optimize the system, by deleting what doesn't need to be there.

Some elements regenerate; some don't. I'm wondering what I can trash in the Tiger OS? I've got a handle on a fair portion of the big stuff, like not installing all the language files (and printer drivers) in the original OS install, dropping unused programs, old movies, mail, outdated sound and QT files, etc.

I've listed a couple of things I'm not sure about. I would like as much feedback as possible, because the slimmer the system the faster it goes.

a] Deleting Languages packs.

b] Installer 'thinning.'

c] Someone suggested dropping some content from the Application Support folder – like the eSellerate folder. I don't know how much content in the App. Support folder regenerates.

d] Eliminating the content from both Tiger 'Logs' folders.

Thanks.