I don't know if this is new (or just new to me), but the latest issue of Beyond the Perf, now links you to this website for new USPS stamp products:
http://stampproducts.com/I'm not yet a fan of this website, as it seems much of the material is embedded in sub-sections. For example, you have to click on "View" for the 2011 Stamp Yearbook, and then scroll down to review the Mail Use Stamp Packs and the USPS Guide to US Stamps, etc.
Not particularly user friendly (in my opinion, anyway).