This is a great hack - we are currently running it on our 6.04 UBB, and it is used quite a bit.
A feature request that I had previously posted: how about adding a "# of votes:" field right underneath the star rating (or next to it) for each topic? It would help further quantify the rating of a post. For example, some posts may be rated as 5 stars, but by just 1 user, but a 4 star rating by 40 members would be far more important.
Anyone else think this would be worthwhile?