The Geekzone Software Store gets lots of visitors looking for MobilMuslim Quran for Pocket PC, but it seems this software is no longer available.
I also receive lots of emails asking for other software covering the same subject. I am not Muslim and can't recommend a specific software, so the easiest way is to use the search for Quran for mobile devices.
You will find 16 Quran for Palm OS, 35 Quran for Pocket PC, 16 Quran for Symbian OS, 1 Quran for Blackberry and 2 Quran for Smartphone. Note that this results are the ones I get now (21 August) and may change as some software are added and others are removed from the list.
The one pictured here is 44883 IMAGiNET Pocket Quran for Pocket PC.