Sharing files between distros

[Collins Richey]

I like to experiment with lots of distros, but I've grown tired of
copying data between distros. Does anyone have a good (ie relatively
trouble-free) scheme they would like to share? I'm principally looking
at the following things. Would shared partitions with symlinks in the
appropriate places be a good idea?

1) home directory. Obviously quite sharable if the ownership and
permissions are correct (uid's gid's match). But what about the
problem of varying kde, gnome, xfce, etc, etc that keep potentially
incompatible hidden stuff in the home directory?

2) var (principally /var/lib for my MySQL/PostgreSQL databases and
/var/www[/??? ] (usage varies considerably) for the apache root
document directory. I'm sure that some distros are relatively
incompatible in ownership and permissions for some of the stuff in
/var.

3) boot. Any reason not to have the kernel, map, grub directory shared
as long as unique kernel names are used? Also a quick way back to
sanity when you encounter one of those accursed distros that don't
allow you to install without overlaying the bootloader.

4) Any other tips and tricks, good practices, etc.

Yeah, I already know the simple answer: just stick to
_fill_in_your_favorite_distro. <grin>

-- 
 Collins
       Head teachers of the world unite: you have nothing to lose but 
       the Start button.