2 Notables - Rss + Rss and Outlook (Both come with source)

First, Duncan mentioned about RssConnect; I've been looking at this app for a week or so now and I loved some of the UI "bits":

• Nice splash screen
• Nice Tools|Options layout (same as VS)
• Nice interaction with a local data store (SQL or Access providers provided)

Overall, very useable UI (good for getting ideas) - but, probably not enough features (yet, although you can obviously add them because it comes with source) to make it my main viewer - mind you it has shown me a few things that I do consider important, such as a database datastore.

Then, in another blog Ed Kaim mentions a workspace project for building Outlook add-ins:

    http://www.gotdotnet.com/community/workspaces/workspace.aspx?ID=E7071B93-7970-4962-A4C2-D72AA2CFBCFF

...sounds interesting!