I've been reading up on it in a new book, Lightweight Backpacking and Camping from Beartooth Mountain Press. What have I learned so far?
I've got more to learn -- I'm only halfway through the book -- but so far the pearls of wisdom are worth the $25 cover price.
At the end of the day today I headed out to Spencer's Butte. The park was actually locked down. There were cars lined up all down the road. If I had to guess, they closed the park because it was so icy. It wasn't immediately apparent, but once you got past the point of no return, the trail was so slick, you had to drag yourself up the rest of the way.
Once you got to the top though, the view was awesome. The Cascades were lit up bright white in the setting sun. The valleys to the West were covered in fog and shadows. It was amazing. Don't take my word for it. Check the pics.
One nasty byproduct of the ice was that people were taking off-trail paths to avoid super slick, packed trail snow and ice. And that resulted in torn up off-trail areas.
Here is a list of the layers I was wearing (since I'm getting more technical about gear):
Fleece lined cap
Lightweight fleece LL Bean vest
Ultra lightweight fleece top White Sierra
Mountain hardware poly T-shirt
Exofficio Nylon shorts
Patagonia Expedition weight Capilene
Wigwam merino wool, lite hiker (seconds $6.50)
Merrell Mesa Ventilator II