I'm curious about inter-city bus ridership figures in the NE corridor and elsewhere. Certainly seems to be a lot more options, and trips, than there were just a few years ago.
To the google!
...according to this, (.pdf) service volume as measured by departures increased by 8.1% from '06-'07 and by 9.8% from '07-'08 nationally, after declining from 1960-2006.
...commenter fred notes the study doesn't include the "Chinatown buses" which obviously greatly understates growth generally in recent years. Lots of Chinatown buses!