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Need a new application? Ubuntu Software Center, which works somewhat like CNET's Download.com, makes it easy to find, pick, and install programs.
Under Unity, Ubuntu still makes it easy to manage your PC's settings.
Number 1: Mint
Mint 11: Based on Ubuntu 11.04, but using GNOME 2.x instead of Unity, I find Mint 11 to be the best of the Linux desktops for daily use.