I recently installed ubuntume. First - ubuntu is the first search result, if u google "linux for humans". It really makes most of the operations very easy. Plus there is sufficient information on forums to help you do more.

Muslim edition adds few programs to ubuntu ...
1. minbar - azaan player based on location
2. zikr - Quran majeed and audio + many lang translation text.
3. calendar - islamic calendar
4. proxy with content filtering