"Gentoo for you, Ubuntu for your grandmother" ;-)
But yeah, let me join in the crowd of amiga users that also enjoy Linux. I have been running Linux on my old A1200 for more than a decade, and it's been a joy ride. Ofcourse Linux certainly has its issues on the desktop, but I _much_ more prefer Linux over any incarnation of Windows or MacOS.
I run my own gentoo setup on my ibook, my eeepc-901, 2 A1200 systems, a quadra 910, Linsys NSLUs, my Nintendo GameCube, the Wii, xbox, the PS3 before I gave it away, my zaurus, a few more PCs and a virtual machines and tings I've forgotten (oh yes, gumstix, asus wlhdd etc) - I also have between 10 and 15 working amigas (A500, A600, A1200s, A3000s, A4000s, CD32s) that are running (mostly) AmigaOS, MorphOS and even a PC where I test AROS... it's all for fun :-)