I compiled a list of all of the Android app stores I could find (63 and I'm sure I've missed some) into a blog post yesterday. If you are an independent developer you might want to take a look at a few of these stores for a few extra downloads.
Personally I have found Samsung to be a worthwhile alternative store.
+Marcel Ulbrich Ah I understand, I thought you had found a warez site in that list. I tried to only list legit sites based on information I found and information listed on other sites. If you find a problem let me know.