Have you ever thought of installing Debian GNU/Linux on a Linksys Network Storage Link? Well, Peter has – and then he did it.
LinuxDevices mentions it, but you can see the whole story at Peter Korsgaard's homepage. I can hear you say why?
Why would anyone want to do this?
Packaged software: There already exist specialized distributions for the NSLU2 (OpenSlug and Unslung), but they are either quite restricted or in early development. The amount of packaged software is furthermore quite limited compared to Debian's 16K packages.
Familiarity: I run Debian on my other machines, so it's easier to maintain the NSLU2 if it's just another Debian machine instead of learning another distribution.
And finally, because you can Debian is afterall The Universal OS.