Dennis sort of organically took over the project. I never asked him to and he never asked could he, he just did it. Open source projects can become heated debates and anybody can "fork" and start their own project. All you have to do is download the source code and then say, "I wish it had a dancing, purple bear in the background" and voila, you have just forked a project. Forking is generally bad because it splits people's time, which is your most valuable resource, since people are only volunteering their time anyways.
Honestly, the Forge project has been very successful and fulfilling. Now I'm just the "old guy" that started the project and doesn't contribute much these days. Dennis, Rob, and others have "found my vision" and enjoy coding Magic. After awhile programming Magic becomes sort of a "meta-videogame" because coding itself seems like a game because you are constantly challenging yourself.
HuggyBaby and GoblinKing have provided Forge's forum which allows for more interaction between the users and the guys who do the programming. Without the forums, Forge would be a lesser program. The forums is also where "us" developers chat and ask each other questions like, "What in tar-nations does the stupid Input class do?".
(The Input class is handles all mouse input and it can be confusing. I started the forum topic "How to understand the Input class in 4 hours or less". I'm joking about the 4 hours part but I still wrote a thorough explanation.)
And last but not least, you the readers (and downloaders) have made Forge special. Forge was written because I had an itch but other people seem to have the same itch too. I'm also the first to admit that Forge is far from perfect but it is still very fun. I play Forge so much, I have a hard time thinking, "What if Forge never existed?"
The Incantus magic project which allows people to play Magic with rules enforcement over the Internet has recently gone "open source". Incantus is written in Python and has a wonderful user interface. The rules enforcement is so good that is probably can implement 95% of all Magic cards in existence.
The Wagic project, which lets you play against the computer and was written for the PSP but can also be run on Windows, is written in C++ and is also open source.
And I hate to leave anybody out. MagicWars lets people play over the Internet like Incantus and is written in Java. Currently it has 719 cards.