I'm going to have a play with kgb I think. Curious
It refused to try a debian iso on the basis that it was over 4gb in size, so it's compressing an ubuntu iso. Either the program or wine is refusing to use more than one core, so it's going to take a while. Set it doing the same task in virtualbox, where it also only uses one core. So I now have the stable running in wine racing the beta in virtualbox. I'll report back.
697156 ubuntu-9.10-netbook-remix-i386.iso #original
686476 ubuntu-9.10-netbook-remix-i386.kgb #kgb's effort
688044 ubuntu-9.10-netbook-remix-i386.tar.gz #standard unix effort
688040 ubuntu-9.10-netbook-remix-i386.iso.gz #gzip's best effort
Decompressing it now, it currently looks like the kgb one does marginally better. It took ages and broke the copy of windows it was running in though, explorer keeps crashing when I select an icon. The version in wine is about halfway through the compression. I'm not very impressed.
It decompressed successfully, verified by md5sum. So I suppose that's something.