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What's RAGBRAI? It's the (Des Moines) Register's Annual Great Bike Ride Across Iowa. Yes, Iowa -- and no, it's not flat! In addition to what's on The Official RAGBRAI Home Page, check out Dave's RAGBRAI Pages.
If you want to know more about tandems, check out the Tandem Club of America, the tandem bicycle mailing list, T-BONE (Tandem Bicyclists Of New England) or Tandem Magazine.
The local bicycle club, the Charles River Wheelmen, also has a page, complete with schedules, cue sheets, and other cycling-related pointers.