Users should be aware that the Android Marketplace will host free and commercial applications just like the Apple iPhone App Store. Most of the applications listed below have been taken part in the first ever Android Developer Challenge.

This Challenge pushed the development of many Android applications and was an important step for the plattform.

Compare Everywhere: Compare Everywhere, formerly known as Android Scan, could be the killer application for Android. It uses the digital camera of the mobile phone to scan the barcodes of products to identify them. It offers then options to compare prices online, read product reviews and even sample music or video content. An alternative seems to be GoCart which basically does the same.

Cooking Capsules: The idea behind Cooking Capsules is simply. Let the user watch a short cooking video, show him the locations of the next grocery stores to shop for the items and give him a step by step instruction on how to cook the meal once he’s back home.

My Closet: The dream application for women. Take pictures of your clothing and the application keeps track and suggests outfits based on weather information and items chosen in the past.

Share Your Board: Jigsaw is an Android application to share, process and capture data on a whiteboard.

Wertago: An interesting application for nightlifer enthusiasts that makes use of Google Maps to show the hottest locations in town and provides means to coordinate with friends.

Got any other applications not in the list? Let me know about them. I did not include applications that would track friends and family members. This had various reasons, one being that every family member would need an Android phone for this feature to work.