There are a lot more than three - there are dozens if not hundreds of Amiga-related forums out there. Why on Earth would you want to merge them?
The three boards you mentioned are all very different from eachother - amigaworld.net is mainly the os4/a1 people and is generally intolerant of anyone without the same view, eab is mainly emulation / classic / retro gaming related - very little discussion of new PPC systems, and amiga.org is everything Amiga whether it's OS3.x, MorphOS, OS4.0, Aros, or even Linux. They're for different people.
