splitting off directories

[Michael Klinosky]

Hello.
I'm about to install F7 on my main computer, and I'd like advice on what 
directories I should split off of / (i.e. put on its own partition).

I already have /home split off, and I'd like to have the webbrowser 
cache split off too (makes backups quicker).

I recenlty read that /usr could/should also be split off - opinions? I 
should note that I'm the only user, and I don't plan on adding much of 
anything (i.e. software). Would this make sense in my case?

Any other suggestions?