Bodhi Linux. I have an old System76 Starling netbook that stopped working after some updates left it in the dust. I think it had a netbook version of Ubuntu on it originally. Years later I installed Bodhi Linux on it (since it was supposed to be good for low spec machines) and I currently use it as an Angband terminal, a photo slideshow device, and occasionally surf the web with it just because I can :)

I'm amazed at how well it works with an Intel Atom processor, 2GB of ram, and a 250GB disk drive. Kudos to the Bodhi Linux team.