Last week I switched to Ubuntu, which is very simply wonderful. Installation is very easy and the GUI is exemplar. Furthermore its pre-installed (with version 7.10) compiz desktop enhancer gives it functions that allow it to dwarf Mac OS X.
The integrated NTFS support and Grub allow easy multi-booth setup (an ext2/ext3 driver for windows is very easy to find and is great).
In the past week I already persuaded two guys to pass to it (and they both liked it very much, altough one of them had problems caused by his lack of an internet connection) and I'm showing it to all my friends.
I particularly like the multi-workspace feature. This evening I found out a lot of keyboard shortcuts that enable nice tricks in compiz. You can find the keyboard shortcuts here. Not listed in the linked article are Super+alt+tab and ctrl+alt+tab, which both enable window flicking between windows from all the workspaces.
