As for news, fellow board member Toybotstudios has a site
www.toybotstudios.com (ironically enough), and he posts a lot of nice pictures with general Japanse vinyl news. Other than that, people just sorta post things of interest here on the board.
For images of a lot of past figures and their colorways, you should try taking a look at
www.canibeonthelist.com. They have some lists of toys by manufacturer and some pictures of the different versions.
For the history of kaiju, I'd wait for the upcoming Super7 Mook... it will have a TON of information about Japanese vinyl toys. If anything isn't covered in there, just feel free to ask about anything you're curious about.