If you are developing Android apps and want to improve your look and feel, you really should check on http://actionbarsherlock.com/ and http://viewpagerindicator.com/
ViewPagerIndicator seems really a good one. Thanks!
You might also want to take a look at <a href="http://square.github.com/otto/">Otto</a> it is written by the same guy as ActionBarSherlock and ViewPagerIndicator. <a href="http://jakewharton.com/">Jake Wharton</a> writes some really interesting stuff :).
I use ActionBarSherlock and i must say: WIN!
This could be interesting: http://android-arsenal.com