I'm not sure if this will work, but you can create a profile field call it Adsense Publisher Id, then put the adsense code in your template and replace the standard publisher id with $blog[fieldX].
I'm not 100% positive that the profile fields work within the blog area, so you might want to wait for a person with experience with the blog comes along, or ask over at vBulletin.com where you can get a definite answer
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