Diana put me onto this terrific post about adaptive cycling for kids, which has lots of links to great resources and products, including the Hase Trets trike/trailer, seen here, and available through TTR. We've done a good bit of adaptive work in the last couple of years and we look forward to offering a wider range of adaptive products and services in the future.
Anyway, put Totcycle on your list if you like adorable kids and adorable bikes.