FB map: Roosevelt Bridge/Kennedy Center

Map of Roosevelt Bridge crossing, to GW, starting at end of Custis Trail in Rosslyn, Va. (at Lynn St./Key Bridge). Start by continuing straight at end of crosswalk onto asphalt trail leading down to Roosevelt Island. The recently renovated Kennedy Center Plaza creates what must be the grandest bike trail terminus anywhere.

MV map: Capital Crescent Long-cut

Adds about 15-20 minutes vs. going straight up Foxhall, but much nicer (except for that canal smell...). All turns marked on this map; view in Satellite/Hybrid to see trails.

MV map: Georgetown cut-through

W/ construction continuing along Foxhall, alternate routes are key. Here's one through Georgetown's campus that avoids the main student pathways. It also avoids most of Resevoir Rd. Must be viewed in satellite or hybrid to see the bike paths, etc.

FABB's big bike map

The Fairfax Advocates for Better Bicycling have put together a great big Google map of FXCo, lined w/ bike routes. Take a look:
FABB's big Google Map of viable bike routes