Here’s the complete user features of Android 2.0 copied from their official website

Contacts and accounts

• 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.

• Sync support for contacts from multiple data sources including Exchange. Handset manufacturers can choose whether or not to include Exchange support in their devices.
• New way to hover on a person to see more info and select communication mode (for example, phone, SMS, email).

Email

• Exchange support.
• Combined inbox to browse email from multiple accounts in one page.

Messaging

• Search functionality for all saved SMS and MMS messages.
• Auto delete the oldest messages in a conversation when a defined limit is reached.

Camera

• Built-in flash support
• Digital zoom
• Scene mode
• White balance
• Color effect
• Macro focus

Android virtual keyboard

• An improved keyboard layout to makes it easier to hit the correct characters and improve typing speed.
• The framework’s multi-touch support ensures that key presses aren’t missed while typing rapidly with two fingers.
• A smarter dictionary learns from word usage and automatically includes contact names as suggestions.

Browser

• Refreshed UI with actionable browser URL bar enables users to directly tap the address bar for instant searches and navigation.
• Bookmarks with web page thumbnails.
• Support for double-tap zoom.
• Support for HTML5:
  • Database API support, for client-side databases using SQL.
  • Application cache support, for offline applications.
  • Geolocation API support, to provide location information about the device.
  • <video> tag support in fullscreen mode.

Calendar

• Agenda view provides infinite scrolling.
• Events indicate the attending status for each invitee.
• Invite new guests to events.