Tenderfoot Boogie, a 50-miler on the trails from Squamish to Whistler, made its debut in 2010. It's back on the calendar in 2011 and I'm signing up this year. The event also offers a 50km and a 28km.
You can check out the course through organized orientation runs, starting late March and finishing in early May. For the schedule and more details, see here.
Along with STORMY on the first weekend in August and the new Whistler Ultra & Relay, replacing the Haney to Harrison 100km ultra and relay on the first weekend in November, the Sea to Sky corridor is offering a great selection of ultras.