In reply to TobyA:
I've been using a pair of Mammut 8.0mm ropes last couple years, think they're brilliant. Just rock climbing though (no white shite!)... I even bought a pair of 70s in a deal and chopped them into a pair of 40s & pair of 30s, instead of lugging a pair of 60s around.
Used alongside those Edelrid 19g karabiners & quickdraws, and Ultralight camalots, the weight saving is considerable.
I've recently purchased a couple of Edelrid Starling Pro Dry 8.2mm ropes. These have a cut resistant Aramid sheath, so less worrying about sharp edges.