These are the waterproof jackets currently carried here at Team Estrogen:

http://www.teamestrogen.com/product/...-c36-c130.html
Read the staff pick write-ups and also reviews posted by other customers. Lots of good information there.

The ones that pack small enough to fit in a jersey pocket would be:
http://www.teamestrogen.com/prodGB_JGOXYW.html
http://www.teamestrogen.com/prodGB_JGOXYL.html
http://www.teamestrogen.com/prodGB_JALPWO_0.html
http://www.teamestrogen.com/prodPI_11231209.html

Though you couldn't go wrong with any of them for keeping warm and dry. I have one of the Gore jackets (from about 4 years ago and I don't remember the model) and it is wonderful. It works best when the temps outside are colder than the temps inside the jacket, which helps draw out the inner sweat/moisture.

I also have an older version of the Pearl Izumi Elite Barrier WxB Jacket - It is hard to describe the material. It doesn't feel heavy enough to keep me warm and dry .... but it does. The inside of the jacket reminds me of those mylar blankets they wrap you with at the end of running/races, but it is better than that.

Edna