I put /home, /var, /tmp and /boot all on their own partitions, so that if any of the fill up it limits the problems that are likely to be caused.
Well, I know that /boot can't reside in an LVM (so it has to be split off).
I also have some custom partitions for storing digital camera pics and distro images on. Keeping these separate makes it much easier when installing a new version - I don't reformat these partitions.
Wouldn't it be possible to have them in /home? /home doesn't get reformatted if on its own partition - correct? (It's an option, I believe.)
And I also just ignore my browser cache in my regular backup job - no need for it to be on a different partition.
Sounds like you use a program for that task. I'm not experienced enough yet to find one I'd like. What do you use?
I just use cd/dvd creator.