Mean Green Cougar Red has a good discussion of what bus rapid transit (BRT) is and isn't, and what its pros and cons are. The two main points:
1. The definition of "true" BRT is important. A lot of bus services that claim to be BRT really aren't. In a nutshell: if it doesn't have its own right-of-way, it's not really BRT.
2. BRT is not a fully-equivalent alternative to light rail transit (LRT). BRT promoters who try to pass BRT off as "rubber-tired light rail" are, at the very least, exaggerating.
And on a related note, you should also take a look at Robert Boyd's post on The Pros and Cons of Taking the Bus. Among other things, you can take pictures while riding, as he demonstrates.Posted by Charles Kuffner on February 22, 2009 to Planes, Trains, and Automobiles