Are there any forums or sites other than the BBB to post consumer warnings and complaints about rip-offs and deceptive claims?

There are plenty of sites, including the Better Business Bureau, local protection offices in your area, your state's regulatory agency (see comments below) or licensing boards, and even certain Federal agencies take complaints (see comments below). But if you are looking for something more public where you can vent your disappointment and frustration, there are a lot of those sites, too. There can always be new sites. Here are some of the internet sites for posting complaints:

PissedConsumer

RipoffReport

ComplaintsBureau

ScamBook

MeasuredUp

ComplaintsBoard

ConsumerAffair

ShamScam