There are 19 Android App Stores - which ones are most important?

• Google Android Market – http://developer.android.com
  
• Appia – http://www.appia.com
• Slideme – http://slideme.org
• Mobango -http://www.mobango.com (free apps and game only)
  
• Samsung Apps – http://seller.samsungapps.com
• Amazon App Store – http://developer.amazon.com
• Vodafone – http://widget.vodafone.com
• Verizon Wireless – http://developer.verizon.com
  
• Cellmania – http://www.cellmania.com/content_providers
• Mobihand / Mobireach – http://www.mobireach.com
• MiKandi – http://developer.mikandi.com
• LG World – http://developer.lgmobile.com
  
• GetJar -http://developer.getjar.com (free apps and games only)
• Motorola shop4apps – http://developer.motorola.com
• BlueVia – http://bluevia.com
• Handster – http://www.handster.com/developers.php
• Optus -http://partnerconnect.optusnet.com.au
  
• Butterscotch / Tucows – http://www.butterscotch.com
• AppsLib – http://www.appslib.com
• Fasmicro – http://apps.fasmicro.net/developers
• Pdassi – http://pdassi.de
• Android Pit – http://www.androidpit.com
• Camangi Market – http://www.camangimarket.com
• DoComo Market – http://www.docomo-market.info
• Sony Ericsson e-store – http://estore.ericsson.com (seems to have died, our apps have been pending approval for months)
• FastApp Store - http://www.fastapp.com
  
• M1 App Store – http://appstore.m1.com.sg/developer
• MobileApps – http://www.mobileapps.com/mobileapps/main/developer.jsp
• Phoload – http://www.phoload.com/developer (free Android apps and games only)
• MV Store – http://www.mvstore.vn
• Exent – http://www.exent.com
• NeXva – http://corp.nexva.com/content-providers
• 1Mobile – http://author.1mobile.com
• AndroidFreeware – http://www.androidfreeware.net (free Android apps and games only)
• Mobiles24 – http://www.mobiles24.com (free apps and games only)
• CNET – http://upload.cnet.com
• Soc.io Mall – http://soc.io
• AppBackr – http://www.appbackr.com
• AndroidApps - http://www.androidapps.com (not sure how this one works)
• AndroidTapp - http://www.androidtapp.com/ (new app store)
• GiveMeApps - http://www.givemeapps.com/
• Nook Store - http://nookdeveloper.barnesandnoble.com/
• Android Games - http://android-games.org/

Reference: http://www.drmop.com/index.php/2011/10/08/the-big-list-of-android-app-stores-where-to-sell-and-what-to-void/