Susan has already posted this on her blog, but I think this update is worth mentioning here as well.
Download this small update for Small Business Server 2003 SP1 or Small Business Server 2003 R2 to allow the connect computer wizard work with Vista clients. Also, be sure to read this post from Susan that lists the whole update procedure for full Vista Compatibility.
By the way… Susan mentions NOD32 (2.7) client is supported. I would like to confirm that, and also highly recommend the Eset product range. I have not looked back since moving our clients to this product.