Google has announced that the Android SDK now supports Android 2.0. Android 2.0 SDK Eclairs includes many improvements and new features, you can find their detail below.

• Multiple accounts can be added to a device for email and contact synchronization, including Exchange accounts. (Handset manufacturers can choose whether to include Exchange support in their devices.)
• Developers can create sync adapters that provide synchronization with additional data sources.
• Quick Contact for Android provides instant access to a contact’s information and communication modes. For example, a user can tap a contact photo and select to call, SMS, or email the person. Other applications such as Email, Messaging, and Calendar can also reveal the Quick Contact widget when you touch a contact photo or status icon.
• Exchange support.
• Combined inbox to browse email from multiple accounts in one page.
• Search functionality for all saved SMS and MMS messages.
• Auto delete the oldest messages in a conversation when a defined limit is reached.
• Built-in flash support
• Digital zoom
• Scene mode
• White balance
• Color effect
• Macro focus and many more.

You can read further detail of features here.

Watch Android 2.0 Official Video