To test this new version of Ubuntu you can do an upgrade from your system directly by pressing Alt+F2 and type in "update-manager -d" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release '10.04' is available, then just follow the instructions on the screen.
New features since Ubuntu 9.10:
latest GNOME desktop environment
Linux kernel 2.6.32
KDE SC 4.4
HAL removal
Major new version of likewise-open
New default open source driver for nVidia hardware
Improved support for nVidia proprietary graphics drivers
New boot experience
New Indicators
New Themes
Ubuntu One File Syncing
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