There are a couple of reviews. Consensus seems to be that while the AF-D is good, the AF-S is that little bit better at most things. I got mine a couple of months before the AF-S came out, and won't upgrade because I'm happy enough with the D. You can also find them for £70 or less used, which is great - you can abuse it without caring too much compared to some other lenses. That said, the AF-S isn't exactly expensive, so would depend on whether the improvement is worth £100.
http://www.youtube.com/watch?v=6my3DO00X28&feature=player_embedded
I also got the 85 1.8 quite recently, so expect an AF-S version of that soon