For a lot of people, the ability to install apps that aren't offered in the "official" Android Market is a big draw. Android devices (for the most part) allows applications to be installed from any source, which has led to alternative marketplaces full of apps. For the most part, they are all well done and offer a safe and convenient experience, but often lack in selection compared to Google's Market. There's plenty of reasons people turn to places like Amazon and SlideME, and I wander and sample from markets other than Google's myself.
This got me wondering -- how many of you guys do the same? I'm betting a good many of us do it, especially at least once a day at Amazon for the free app. Let us know in the poll!