Reasons to be Comment spam 3 2 1 zero

Google announced yesterday that they will not consider links in a webpage if surrounded by a nofollow tag. The upshot of this is that comments can be surrounded by the nofollow tag and google will not consider these links in pageranking. When I first read this it sounded a great solution to the commentspam problem. If everyone follows this solution, then there will be little point in doing the spam and hopefully it will stop - but therein lies the problem - everyone needs to follow it. Scoble reports that already MSN and yahoo have announced they will also use this tag. Also interesting that they've done this in a couple of days/hours as opposed to having to use a committee to do it.
It will be something that I'll be looking at putting in my MT implementation soon (details from their news page on how to do this) - when I get some time!