Mugen infantry is still alive, it's forum is dead though. Though the webpages on it seem like they still work. That's good news!
Also keep that link active, you never know when his stuff could go offline.
I recommend you post that at MFFA for safe keeping and or the mugen chronicles.
As a matter of fact, if mediafire ever goes down, the majority of our forum's downloads will go down the toilet!!! Maybe we should back this stuff up on another file host just in case?