I've talked about the WAS Feature Packs for WAS 6.1. There are now feature packs for WAS 7.0 and some other WebSphere products as well.
WebSphere software early programs lists gives you access to new WebSphere stuff before it's production ready. Currently listed are a couple for WAS 7.0:
- IBM WebSphere Application Server V7.0 Feature Pack for Service Component Architecture (SCA) V1.0.1 Open Beta
- IBM WebSphere Application Server V7.0 Feature Pack for XML Open Beta
And a couple of other items:
- WebSphere MQ V7 Open Beta Program
- IBM Monitoring and Diagnostic Tools for Java - Health Center v1.0 Open Early Access Program
This is one of the IBM software early programs, which also lists early programs for the Information Management, Lotus, Rational, and Tivoli brands.
Update: See also: WebSphere Software Early Programs.