I'm on Dapper; so it's 0.3.4-0ubuntu8. I presume you mean what GNOME theme? it's one of the H2O themes: H2O-gtk2-Amber. I could restart it with valgrind -- unfortunately it'd be assuming that this will happen again, and I can't guarantee that :( -- notification-daemon using 237MB of memory https://launchpad.net/bugs/67129