The Cascades have gotten a healthy dump of snow in the past week, and many of the Nordic trails are groomed and ready to go. Here are some useful links for skiing in the I-90 corridor:
Cabin Creek/Erling Stordahl trails - Just off exit 63; daily grooming updates are posted here. More info from the Kongsberger Ski Club. Also see hourly temperatures at various places in the ski area.
I-90 Sno-park ski areas - Washington State Parks maintains a number of groomed ski trails in the Snoqualmie Pass area, including Hyak, Crystal Springs and Cabin Creek. A full list with grooming updates is here.
Summit at Snoqualmie Nordic Center - The alpine ski area also maintains a system of Nordic trails. More info here.