I've been looking high and low for tire reviews lately, and haven't found much worth reading.
There is a nice BMW tire review page, whose format would be wisely copied for use on SBW: http://www.conary.org/bmwtire/
How about it? Tire reviews sorted by tires and by sportbikes, with averaged and individual mileage, dry/wet grip ratings, etc. provided by SBW members? Doesn't have to be opened up for discussion (which would quickly get out of hand), just let people can post their ratings in a standardized way and we can find out what works with what. Maybe let raters have 20 words or something for added comments beyond their ratings.
Shouldn't be too hard to program, esp. if you can snatch the code off of the BMW page.