This is a big day for Android users.

Firstly, the platform is growing at an extraordinary rate. It has increased to nearly 30% US market share in less than two years.

The daily run rate is now 100,000 units per day! This is seriously good.

There are 50,000 applications in the Android marketplace. Not all of them are good, but it’s still a huge milestone.

And, recently, Android 2.1 became the most-used version of the OS at 37%. But Android 2.2 is the big news today, and here is what you will see:

• JIT Compiler to speed up non-native apps
• App data backups instead of just app backups
• Much better exchange support
• Built-in wireless tethering and wi-fi hotspot support(!!)
• WAY faster browser
• Flash and AIR support
• Auto-update from Marketplace
• Apps to SD Card support
• Music downloads from the Marketplace (!!)
• Streaming your own non-DRM music from your desktop to Android
• Google TV was announced
• Four new mobile ad types (www.google.com/mobileads)

The SDK has been released already, and the update will start being released to OEM manufacturers in the coming weeks. As for when the Nexus One, Google’s flagship device, will get the update, that is still up in the air. For most people, though, it probably won’t be soon enough!