This summer I participate in Google Summer of Code 2010 working with Apache Software Foundation. Many thanks for Google for that program as it's great opportunity for students to start open source adventure.
My project idea(described in details:
aims on developing Apache CXF module that allows to secure RESTful services with OAuth (version 1.0a).
I have started already development, current stage:
I base on OAuth 1.0a specification: http://tools.ietf.org/html/rfc5849
and use OAuth library: http://code.google.com/p/oauth/ that helps developers create OAuth consumer and providers.
If you are interested in this project you can follow it this blog, I will update it with some after some main steps.