Most of the People use Source Tree for using Git repositories.
But Source Tree misses some of the options in windows like Context Menu usage and Icon Overlays.
Recently I came across a different client called Tortoise Git.
TortoiseGit is a coolest Interface to Git Version Control. It is a Git Version of TortoiseSVN.
TortoiseGit supports you by regular tasks, such as committing, showing logs, diffing two versions, creating branches and tags, creating patches and so on.
More Screenshots about the features in ToroiseGit are here https://code.google.com/p/tortoisegit/wiki/Screenshots
You can download Tortoise Git for windows here https://code.google.com/p/tortoisegit/wiki/Download?tm=2
Keep Software Weird 