Check out this insane cornocopia of model MTA links: MTA layouts 1, MTA layouts 2, MTA layouts 3, NYC Model El Trains, NYC Model Transit Association, NYCMTA2 (amazing mini-Dondi graffiti!), and great layout by OnTracks2 (check out the graffiti on the tunnel walls!). If you want to buy a very cool present for your transit nerd friends, consider some of the great model trains, cabs, police cars, and buses on sale at Collect-Corner.