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         Android is a software stack for mobile devices that includes an operating system, middleware and key applications. The Android SDK provides the tools and APIs necessary to begin developing applications that run on Android-powered devices.Initially it was developed by Android Inc but later purchased by Google. Now google is the owner of Android Inc and running it and now they have released new Nexus One mobile with upgraded Android OS running on it

         Here is the list of 10 Best Google Android Applications easily available free as well as pro in Android Market.
01>  Lyric Search – Lyric Search searches LyricWiki.org for Lyrics to virtually any song. Search by artist or song name, copy and paste lyrics into sms, email, or other applications, and save lyrics or buy the song on amazon mp3 

02>  Note Everything - Jot down all your notes in Note Everything. Users can type, paint, or voice record their notes and organize them in folders and can search notes and import or export notes on the SD card. Photo notes, reminders, notifications, and encryption are also available in a pro version. 

03>  BioWallet - Uses your phone's camera as an iris scanner to lock down sensitive information like account numbers and passwords on your phone, or even the phone itself. Handwriting-based IDs can also be implemented, all processed for an additional pass/fail reading all processed on the phone itself which keeps biometric data secure. 

04>  Thesaurus – Retrieve the synonym and antonyms , related terms, similar word and user suggestions for every word ,Tap one of the results to start a quick new search for that term. As well it keeps a history list of your search terms.  

05>  WikiMobile Encyclopedia - A walking encyclopedia at your fingertips. Carry 2 million + Wikipedia articles with you, including pictures. Faster and uses just a fraction of the network data vs. the Android browser. Download free for a limited time 

06>  Handcent SMS -Best texting tool for sending or reading SMS messages. Settings allow popup notifications, reminders for unread messages, pre-typed quick messages, batch deleting, and a much better interface for communicating than the default texting app.  

07>  Meebo IM – Meebo is a free IM program that supports AIM, MSN, Yahoo, MySpace IM, Google Talk, Jabber and ICQ. You can also sign in using a Meebo account and your chat history will be saved forever, and can be accessed from anywhere

08>  Twidroid – One of the market leading twitter client on the android platform ,includes features such as multi-account support ,video posting, desktop widget, bit.ly support, follower listings, interface themes and others.  

09>  Opera Mini – One of the best leading and famous mobile web browser also available on Android phone . Opera mini compresses pages up to 90%, making web browsing fast. Many cool features such as Synchronize your bookmarks, history, notes and more between your PC and mobile phone 

10>  Android-RSS – A fully functional Android RSS reader created as a way to learn the new Android platform SDK. This project is an ongoing effort to better understand and embrace the Android design philosophy, welcoming comments and additional contributors. 
 
Download Applications from these sites:  Free + Pro

1. android.com/market
2. androidsoftwaredownload.com
3. modmygphone.com/apps
4. androidfreeware.org
5. www.androiddownload.org
6. modmygphone.com/apps
7. HelloAndroid

            
                 Android is designed and optimized for mobile phones. Which support 2D, 3D and OpenGL ES 1.0 technologies. It can support all types of media formats like GIF, AAC, MP3, PNG, MPEG4, AMR, H.264. Android includes WiFi, 3G, EDGE, Bluetooth and GSM technologies. Tools for debugging, Plugins, Device emulator and memory and performance profiting etc are the key features of Android.

Downloading Android applications :
iPhone has hell lot of applications free as well as premium but that does not beat android as there are also many applications
To download android applications into your mobile phone you just need to launch the Android Market in the application menu, search for “desired application”, and easily install them.

Useful Links :

Partners
Entire platform source and information on how to contribute.
Developers
Create Android applications.
Android Market
Set of apps and games available in Android Market.