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Ladies and Gentleman, Designers and Developers, I'm proud to  pronounce to you that Silverlight 2 Beta2 was released on 06.06.2008, as you can read from Scott Gu's Blog here are some information

Differences:

Browsers that have Silverlight 2 Beta1 installed which visit a site that hosts a Silverlight Beta2 application will be prompted to upgrade to the newer beta of Silverlight

Silverlight 2 Beta2 will not run applications that target Silverlight 2 Beta1, since they made a number of API changes between the two betas for the new features being added in Silverlight 2.

Once they do this they won't be able to run Beta1 applications without uninstalling Beta2.  This means that if you have published a running sample on the web built with Beta1 you will probably want to update it to Beta2 soon. 

Microsoft has published a document that details the changes between Beta1 and Beta2 here that can help with this.

"theADOguy" wrote one article for Upgrading your Silverlight 2 Project to Beta2:

• If you're not using the Calendar, GridSplitter or DatePicker, remove the System.Windows.Controls.Extended.dll from your references.  You don't need it for most controls anymore and its pretty big so it will just balloon the size of your .xap files.
• If you are using ControlTemplates, you may need make a lot of changes. Look again at the default templates (Reflector is a good way of getting the generic.xaml that contains all the templates) to see how you should change them.  TemplateParts have changed names and they are mostly using VisualStateManager for transition effects.
• Upgrade to the new Silverlight.js to your project if you are using it to host your project.  Its is in the SDK directory under "Tools".

Read this if you want more details about What's Changed in Silverlight 2 Beta 2?

Just for revision here re some of the major features of Beta2:

Visual State Manager - (VSM) feature that makes it much easier to build interactive control templates; introduces two basic concepts that you can take advantage of within control templates: "Visual States" and "State Transitions".

TextBox editing control: scrolling with text-wrap, multi-line text selection, document navigation keys, and copy/paste from the clipboard are now supported....

Input support: keyboard support in FullScreen mode (arrow, tab, enter, home, end, pageup/pagedown, space)

UI Automation and Accessibility: UI Automation (or UIA) enables screen readers and other assistive tools to identify and interact with the components

UI and Control Improvements, More Built-in Controls, Control Template Editing Support

Animation and Graphic System: animating custom dependency properties

DeepZoom: supports an XML based manifest file for DeepZoom collections, extensible MultiScaleTileSource support (which allows developers to hook up existing image pyramids that don’t conform with the Deep Zoom format to the high performance rendering of Deep Zoom)

WPF Compatibility, Media Improvements, Adaptive Streaming, Content Protection, Server Side Playlists, Networking Improvements

Cross Domain Sockets - now enables cross domain networking support using both HTTP and Sockets (meaning your application can call sites other than the one the application was downloaded from)

Duplex Communication (Server Push) - support for setting up duplex communication channels with a WCF service on a server

Web Services, Background Thread Networking, REST and ADO.NET Data Services, JSON, Data Improvements (DataGrid, DataBinding, Isolated Storage, )