I already have .com .net .biz .info.
Nearly every time I send someone to .info or one of the others, they end up on .com, instead -- which is why I provide so many links on most of my sites. (FAA being the exception. If they get to my FAA/AW, which is .com, I don't want them to leave.)
I've found it very, very difficult to break the '.com' habit with users.
Lutz, let us know how .gallery works for you.