Actually, I've been around longer then most of the "other" ones (since mid 1997). I've been around longer then even GenForum as I helped the original programmer and owner of GenForum by linking to the multiple forums.
We've posted both the History of Medway which has an Allen line, and the Allen Family Records by J. Montgomery Seaver.
We also provide 140 additional links to Allen resources across the web.
If you don't think you need an "additional" site, then that's your choice. I think others can make their own choice themselves though.