Thanks to HikingDrews's recent comment, I discovered eyehike.com. It's a treasure trove of resources – especially for the Wonderland Trail.
I haven't spent as much time as I would like on the site yet, but here are some of the things I've found so far:
- Movie about the flood-damage caused to Rainier in the 2006 storms.
- Spreadsheet with Mileage Chart
- Trip Overview Notes Document
- Elevation Profiles and other goodies
Check it out – handy site.