Ubuntu Tweak is an application to config Ubuntu easier for everyone.It provides many useful desktop and system options that the default desktop environment doesn’t provide.With its help, you will enjoy with the experience of Ubuntu!
Ubuntu Tweak 0.5.0 is very important version which released on January 10th.It has new fresh interface, the ability to sync data from the website and lots of new options added.
* Overview changes:
- Drop the support of Ubuntu 9.04 and before
- Use all native icon in UI
- Migrate from policykit to policykit-1, no C code any more
- Support dynamic-module, only load module what desktop supports
- Redesign the sidebar and titlebar
* New features:
- Application Center: improve from Add/Remove, supports online data sync
- Source Center: improve from Third-Party Source, supports online data sync
- Update Manager: a simple but more human-readable update manager
- Improve the computer page, add “Change Hostname” feature
- Add indicator-session dialog control
- Add the menu and button icon options to gnomesettings
- Add the show desktop icon again
- Add the option to disable user list in gdm
Install Ubuntu Tweak 0.5.0

If you would like the command line,you can install this new version by following command:

sudo add-apt-repository ppa:tualatrix/ppa
sudo apt-get update
sudo apt-get install ubuntu-tweak

Alternatively,download the deb package from this link:
http://launchpad.net/ubuntu-tweak/0.5.x/0.5.0/+download/ubuntu-tweak_0.5.0-1~karmic1_all.deb

More about Ubuntu Tweak 0.5.0,see:http://blog.ubuntu-tweak.com/2010/01/10/ubuntu-tweak-0-5-0-released.html