After reading some posts here about it still being icy out at Knik, we decided to try out sheet metal screws in the tires. About $7 worth of screws (#10 hex head, 1/2" long) did the trick! Went out on Friday in the sun and were able to get to the glacier without to much trouble. The trail near Friday Creek has a lot of large puddles covered with 1" of ice. Negotiating these was a little tough (the ice would break and we would get on top of the broken plates and slide around) but the screws did great. Metal Creek has a couple ice bridges left or you can find a spot to drop in and cross. It looked like it was just over a foot deep. Jim Creek is no problem. Maybe 1' deep in the area most people were crossing.
It's a great time to get out to the Glacier!