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Here are a couple pic's for ya Tom!
The poncho also has a built in stuff sack that is attached on the inside up near the back of the neck and works very well, the last pic with it next to a 16oz...

Sorry but I didn't get a chance to get the pic's of it yet, darn kid's wanted to play all night, and after I finally got them to bed I was sooooo exhausted, will try today!?!?

My Driduck's with weather mod weigh's 9oz, it's multi-use, and for me it works! For some it might not! If I get a hole in it thats one of the reason's I have duct tape (besides all the other...

Also here is a video link that was done about it,
http://www.hammockforums.net/forum/video.php?do=viewdetails&videoid=66

Tom,
It is a DriDuck's poncho that you can purchase from the Jacks that you purchase from them ( here: http://www.jacksrbetter.com/DriDucksPoncho.htm )
then you purchase the weather shield mod from...

The cost for it is $12.95 for the poncho itself, and then another $25.90 for the weather shield mod applied by the Jack's!
I can't speak for whether it will fit the WBBB, but I have one and it fit's...