Payday loan broker (NOT a loan company) that collects personal information including Social Security number, bank account information, etc. to be forwarded to potential lenders. Also, according to terms of service you grant permission to have spam texts sent to your phone.
NOTE: The 323 area code is a Cingular cell phone in the Los Angeles area, but their website www.500cashVIP.com is out of Canada.
WARNING: THIS SOUNDS LIKE A PHISHING SCHEME. Other internet scam reporting sites show that this scammer uses several different websites to phish information.
A complaint has been filed with the FCC and Cingular.
I believe it was originated from a Dave Mathews Band text to win free tickets. They must have used people's numbers that requested the free ticket drawing. Those are the only texts that came in and out of this phone.