Steam is by far the most popular video game distribution platform in the gaming world. Valve's software client offers a vast treasure trove of games to PC gamers all over the world. With its massive library and regular sales, it's a paradise for both casual and serious gamers who love a good deal. But tread carefully, for with great choice comes great responsibility. The allure of Steam's extensive library can lead to the dreaded "backlog syndrome," where games stack up faster than dirty dishes…