Jarery
MEC has these sock which are like plastic bags, only much better.
I've used them for a few weeks now and and they make a huge difference while riding in rain. My feet are completely dry even though my shoes are soaking wet.
Here's the link,
http://www.mec.ca/Products/product_l...=1136845816393
They are the one's at the bottom of the page, they're called Integral Designs vapour barrier liner socks. The best $22 I've spent.