Connecting Salesforce.com from Google AppEngine using OAuth

Here's a blogpost on how to connect and authenticate salesforce.com from an application deployed on Google AppEngine using OAuth protocol.
http://blog.sforce.com/sforce/2010/04/connecting-google-app-engine-and-salesforcecom-with-oauth.html

See how the complexity of the OAuth protocol has been hidden by the helper APIs of OAuthAccessor and OauthHelperUtils.
Refer to this demo project written by Jeff Douglas.