I live up near Boston and was checking alternatives to get to NYC for some meetings next month. BOS has the twin problem of TSA carryon restrictions and horrible highway access with the tunnel from the MassPike closed.
Anyway, I found a link to LimoLiners, they run upgraded motorcoach from downtown Boston to Manhattan in 4 hours for $79 each way. That includes wireless internet, video, power jacks, reclining seats, footrest, attendant for drinks/snacks.

I am going to try this soon, if it is as advertised no more shuttle to NY for me.