After trying several times to reserve a March '08 date (I thought it was a problem with my browser!), I agree that not being able to reserve even 180 days in advance is ridiculous, to say the least.
These guys are in the travel industry, for goodness' sake!!. You can check rates and even reserve March '08 dates thru the internet in a Car rental or arline web site. Are you telling me that Disney is unable to do so? Even if that were the case, just checking the dates and giving a simple message is not rocket science.
Regards,
Luis