I think this is already mentioned somewhere on hearth.com, but it would be nice for us to start up a "firewood identification" picture gallery. There are a lot of sites that help identify trees by their structure, leaves, and sometimes bark, but that's not very much help for those of us who don't often take down entire trees. I've also seen quite a few helpful BTU charts out there, but they don't help unless I already know what wood I have.
A quick description, a couple of pictures of green/seasoned splits, and some info about splitting difficulty wouldn't be too hard to put together.
It's simple enough to (generally) tell if you have hardwood or softwood, and in some ways knowing the actual species is just trivia. Additionally, many folks here seem to "just know" species from years of experience, so it's probably not urgently needed, but it would be good for newbs like me