Its a pretty decent guide, i wonder if IPU has the hardcopy version available for purchase. Im not looking for it personally, as i have plenty of books already on planted tanks, but its a great starting point for some, especially the layout section
Aquaticplantcentral.com has a really good plant ID system. The nice thing is, the list consist of plants other hobbyist has grown; their experience, requirement and etc. Got a lot of the uncommon rare plants as well. All real photos of the plant.