Compress your /usr to save space

I just found clever post with steps to make more space available to your root partition by having /usr compressed with squashfs and overlayed with unionfs. So I'm adding it here as note to self to try it on my Ubuntu on USB disk, where I devoted to much space to NTFS partitions :) It also could be fine for Aspire One, if my wife will start to actually store any files there, not just do the browsing.…-the-eee-pc/

Oh yes, and according to this comment, Ubuntu 8.10 works nicely on Aspire One, so if I'll be willing to sacrifice nice bootup times of Linpus to more standard way of administration (at least for me), I might give that a try.