#PLENK2010: Being too open!

Ok, pet peeve time...choosing a hashtag!  I get MOOCs, open courseware, connective communities, etc., and the value in having each participant choose the way in which they want to interact with content and individuals.  But we should all be able to agree on having a single hashtag to filter our discussions.  It would be great if we could all agree on one hashtag for this course.

...wondering what percentage of participants are using #PLENK2010, #PLENK10, PLENK2010, etc...  And which hashtags are most people using?  And what's the criteria for choosing a hashtag, if there is one?

I'm sure it's just me, but this does drive me nuts.