One of the things we are looking at right now is how to get more votes (helpful / funny / agree) into the system. Currently, voting on a review is a multiple click process. One click to open the voting box, and then more depending on how you are voting. We are going to try and make this simpler.
The second piece of this is looking at how we might expand the universe of people able to vote on the helpfulness of a review.
As a fairly prolific RIA reviewers, I know I enjoy getting votes and comments on my reviews. Making this feature easier and available to more people should help me (and everyone else) get more votes.