I put up the Tiamat Alpha for people who already own the e-Adventure Tile Mapper. You need to be logged in before going to the site. Keep in mind this is just an Alpha version, which means not all the features are implemented. And it's important to note that you can't export maps yet. You can just make them.
Click here to load the Tiamat Alpha.
One thing people are going to want to do is make sure they have all the tiles they own in their library. If you don't see a tile or set in your library, there's a form for submitting a request to get them added.