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So, we're in the Dot Barratry Era, huh? Perhaps Dave Winer should sue Tim O'Rielly, as the [you-know-what]2.0 would be nothing without the buzz from the [yeah-that-too]osphere.
It has already been settled amicably, but O'Reilley still claims a right to approve or dis-approve any use of the phrase "Web 2.0" in the name of a Conference. So, yes, you can continue using the term as long as you're not physically in a group, and the "Pr0n Web 2.0" convention is going to change its name to "Pr0n Web 69.0"...