I saw this blog entry and just had to share it - a number of Silverlight application (don't know how many will work with the updated Silverlight builds) - WPF Cornucopia - A selection of WPF-based applications.  Below are some of my favourites.  There are many more on the blog entry

Some cool WPF and Silverlight applications that you can download or play with today. The deployment model has been added so that you know what you are getting into as far as installation goes. Lots are using ClickOnce .application files and .xbaps, so installation is trivial!

My Web Pages Starter Kit
New with Silverlight Demo
(Web Application)
New York Times Reader
Next-generation online reading experience for the NY Times
(MSI)
Microsoft Calendar Printing Assistant
Generate printed calendars from your Outlook schedule
(MSI)
Microsoft Expression Blend
Designer tool for building WPF experiences
(MSI)

Microsoft Expression Design
Illustration and graphic design tool
(MSI)
Microsoft Windows Live for TV
3D access to Messenger contacts from Media Center or IE
(MSI)

Wikipedia Explorer
3D exploration of related articles from Wikipedia
(Application)

iBloks
Mashup application for creating 3D movies
(MSI)
RikReader
RSS Reader that integrates with Internet Explorer 7
(Application)

Nostalgia
Yahoo! Flickr browser and photo manager
(Application)
Cine.View
Netflix movie queue manager
(Application)

Actipro Wizard
A control for building wizard dialogs in WPF
(XBAP)

British Library Turning the Pages
British Library's 'virtual viewer' for some of their most precious books
(XBAP)

ITN Hub Player
Video clips and news stories from ITN
(Application)
Evolution Media Center
HTPC Front-end with stunning animations and dynamic XAML-skinning
(ZIP)

WeatherNews
Weather visualization
(XBAP)

DOSV
Computer Configuration
(XBAP)
Roxio Central
DVD and CD Burning Software
(Application)

90 Degree's Radius
Reporting Tool for Business Data
(Application)

Forbes.com Reader
News Reader Application from Forbes.com
(Application)

Seattle Post
-Intelligencer PI Reader
News Reader
(Application)

Dev Components
Office 2007 Ribbon for WPF
(Application)

Daily Mail eReader
Online reading experience for UK Newspaper
(Application)

The North Face In-Store Explorer
Go to Store to experience
(Retail kiosk)

Windows Vista Magazine
Uses same viewer as the British Library app
(XBAP)

ttfn

David