Did a reinstall of Lubuntu on my laptop as something went wrong during the upgrade to 12.04 (codenamed Precise Pangolin). Just as well, since I have /home on a separate partition so didn't lose any of my data, just the tons of programs that I haven't used for ages. I'm sticking with Lubuntu because Ubuntu (at least version 11.10 of it) was too resource-hungry for my machine.
Instead of the GNOME Do launcher, I now use Kupfer. Very snappy.
Followed these instructions to install Dropbox. Had to install gcc to get it working. Then followed the instructions here to get Dropbox running automatically each time.