I just installed the beta in a VM. Looks like they still haven't replaced the hideous default theme (Human). If Ubuntu is going to go head-to-head with Snow Leopard and Windows 7 it needs to be more appealing out of the box.
On a positive note, nice to see Ext4 available. I think the next release will enable it by default.
While I am certain that Snow Leopard is going to look pretty sleek, I personally find that Ubuntu looks a lot better than Windows Vista/7. I could be biased because I am sick of Windows as an operating system. However, I think font and color rendering and overall interface looks a lot better in Ubuntu.
> Cloud computing (mimics AWS)
> Faster boot up (always yay)
> Easy mail servers (big hassle addressed)