Easy version control for two-person team
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What free, web-hosted, non-public version control system is ideal for a small, two-person project (1 programmer, 1 artist)? It should be as straightforward as possible, plus ideally should have a GUI for Windows.

To give you some idea, we've used Perforce in our last project (team of 9), and found that it oftentimes made our lifes harder, rather than easier.