Are you comparing the same room types? Sometimes disneyworld.com gives you preferred or water view rooms before standard view, or that may be all that is available.
standard value room with tax in value season is $89
preferred value room with tax in value season is $101...
2005 value prices started at $77, 2006 value pricing starts at $79
You need to add the 13% tax (all-stars) or 11.5% tax (all others) to get the price that you pay, in this case $89....