Last year, Linspire announced that it was opening its software distribution service, CNR (short for Click 'n' Run), to users of the Debian, Fedora, openSUSE, and Ubuntu distributions. A month ago, it announced a beta version of CNR that includes support for Ubuntu 7.04 and 7.10 (the two most recent versions), with versions for the other systems on the way. Alas, after trying it on my Ubuntu system, I think it needs work.
On my system, which is basically a stock Ubuntu install, installing the CNR Client (available through a Linspire repository or through a provided .deb package) also installed 13 additional dependency pacakges. The procedure also added users to the cnr group (apparently, only users in the cnr group can use CNR), so I restarted my computer just in case.