I really like the Wizards of the Coast content on Roll20. With the Compendium and the Monster Manual, there's a lot there. However, there's still a lot in the Dungeon Master's Guide that requires me to have the book sitting next to me while I play. And maybe that's what they want. But it would seem to make a good deal of sense to offer a Roll20 version of this as well, with things like Rollable Tables, Handouts for Magical Items, etc. It would would also go a long way to getting more DMs to make their own homebrew content I would imagine.