So while I'm waiting on my new Laptop thought I'd think about disk partitions.
/boot (so both can share same boot files) 10Gb (maybe turn this into an LFS console install or "usb" install later on)
/ (ubuntu 9.10 64) 20Gb
/ (ubuntu 10.4 64) 20Gb
<empty logical space> remainder
That way default boot will be active install.
Home and backup stay in sync.
When I go to install, 10.4, I'll tell it that /backup is /home,
If I like it I'll turn original home into backup and clean off the 9.10 for the experimental installs.
If I don't like it I'll try Kubuntu, Xbuntu over there.
I've got an external 7200RPM 320Gb usb drive.
Thinking I'll turn it into Milestone backups.
Maybe a dd copy from head to tail, including boot sector.