pulled up a few pastry-focused blogs & websites for you - don't know if they'll be useful:
of course there's also David Leibovitz:
The sites above are mostly private blogs or owned by chefs... I am almost sure there is nothing for cakes and pastry as there is for bread with thefreshloaf, which is a great community and forum for avid breadmakers. fyi, the closest thing for cakes and pastry I have seen is The Daring Bakers.
Thank you for your help!