Four but only three are in full commission:
2010 Norco City Glide- urban machine for commuting, errands and generally hacking about. Hope to get Mrs Nelson on it this summer
1997 Mongoose Hilltopper - my winter ride and I use it for longer distance commutes (when I work out of town).
2006 Surly Cross-check - I use this bike for all my recreational riding everything from road rides to hitting rail trails. Not is the same class as a thoroughbred race bike but it's robust enough to put up with the crappy roads around here (and my weight).