I have acqired a number of new teaching tools in-world. One in particular is of interest. I bought it for a few Lindens and it seems to provide a way of posting to blogs directly from within second life. I haven't tested this yet but it seems like a nice tool. I have also acqired a number of presentation and teaching aids from excellent the EduNation Island shop. I've yet to test these though.
See this link for an excellent site on 'Sites of interest to educators in Second Life'.