April 2010 15" MacBook Pro/2.66GHz/Core i7/8GB RAM/OS X 10.6.8 (Build 10K549), and the command runs as expected:

Code:
Artie's-MacBook-Pro:~ artie$ bless --info --getboot
/dev/disk0s2
Artie's-MacBook-Pro:~ artie$

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire