Have a look at my personal installation log, but in a new basic image I wouldn't include any of the bigger things I've installed. Perhaps rsync, vpnc and tree would be useful smaller additions.

The new OO from squeeze doesn't break sound, in fact, only once you upgrade libpulse0 to the squeeze version, which is however necessary in order to be able to install things like calibre and eric. If you find out how to fix sound with that, please let me know how - so that I, and perhaps some others with elaborate installations, don't have to start from scratch. Feel free to add comments in my installation log!

A fun thing would be the above streetview app of debernardis. If your new image includes kazehakase, a new easy-deb-chroot package could ship with a Google streetview app out of the box!