Well, Games Workshop has come out with a tactica of army lists and advice on how to use Marneus Calgar and the other Chapter specific leaders (not for Ultramarines). It looks like there is some good stuff in here. This should be some help fo rthose of you wanting to spruce up your vanilla marines!
Also, Games Workshop's What's New Today article has some advice on how to make the most of your Storm Raven. It is rather interesting to get GW's opinion on this, since I don't think I have seen them do something like this before. They must really want to sell those Storm Ravens!