[j_petrucci]

look at
http://www.tsplines.com/

you have the best of both worlds

mmh.. it seems pretty interesting and promising!
but I still can't figure out the main differences between T-Spline and Subdivision Surfaces...

and there is some software actually implementing them?

[Aldaryn]

If you can trim, cut, boolean those T-Spline surfaces like you can with a NURBS, and if you can select, edit, copy, edges, verts, faces like you can in a poly model, well, T-Spline can be a killer.