The Thief franchise may have come to an ulitmate end, but master taffer Garrett is still fleecing nobility, thanks to an incredible number of fan-made missions. Nine years after Thief: The Dark Project arrived in stores, modders continue to create adventures for the classic sneaker and its sequel, Thief II: The Metal Age. (The Xboxian third game, Thief: Deadly Shadows? Er, not so much.)
Check out Thief: The Circle ((www.thief-thecircle.com)) or The Keep of Metal and Gold ((www.keepofmetalandgold.com/)) to plunder vaults filled with more than 500 missions. Dozens of these escapes are worth your time and water arrows. I'd recommend old faves like Purah's Calendra's Legacy, Saturnine's The Seventh Crystal, Alex Thompson's Ranstall Keep (in noirish black and white, no less), and the Dark Engineering Guild's T2X: Shadows of the Metal Age.

Had Looking Glass lived long enough to make an expansion to Thief II, it might have looked like T2X: Shadows of the Metal Age. This fan-made add-on features a new female protagonist, 13 missions, 3000 lines of dialogue, and custom mission briefings and cutscenes. It doesn't quite have the mysterious allure of the original games, but it's awfully close...