Huh? Nobody's posted on this thread in a week? It just shows how much we care about the portal. =P Here's my suggestion, which I've put a lot of thought into - I hope you all appreciate it. =)
My suggestion is what I think is a great idea: customizable reviews. See, everyone reviews differently and looks for different things - I, for example, look at melodies, harmonies, percussion, sound choice, attitude/atmosphere, and the song overall. What I think could happen is that there would be six 'subratings' where Originality, Clarity, Diversity, and Effort could be. Four would be filled with the previously mentioned defaults, and two would be left blank. The reviewer could replace any of the four with their own 'subratings' and add their own if they so wish. They would even be able to set their own defaults on the account options page, so they don't have to reenter them every time.
This would definitely increase the diversity of reviews, and the better reviewers would get more reviews asking for a review from them, because their unique style of reviewing is especially appreciated/popular/wanted/etc. Overall it would definitely increase the importance of reviewing here at the Audio Portal.
Actually, it could even be applied to the Flash Portal, as well...