All of these pages are run by Hasbro, Takara or one of the companies with a
license to use Transformers stuff. As such, they're all 100% legal and
kid-safe, although the code may make older browsers barf.
Hasbro's official Beast Machines page, it was recently updated and is
actually very informative. It has pictures of all the Beast Machines toys
currently out in stores, plus techspecs and downloadable PDF files of
Takara's not so good about having stable sites, so this may vanish without
warning. Also, it's in Japanese, which will show up on most English-language
browsers as gibberish characters. But there's plenty of pictures of the 15th
Anniversary reissues and othe stuff.
Mainframe's official page, which includes Beast Machines among other stuff,
like Reboot. There's not going to be as much about Transformers here now,
but at least they cleaned up the nasty code-heavy stuff. Saban is doing
Robots in Disguise, but www.saban.com doesn't exist. Once I find out about
an official Saban page for Transformers, I'll add it.