From Twitter:

The original post came from @CaribbeanJim that there is 49-Hour $49 all inclusive sale on selected caribbean locations like... Aruba, Dominican Republic.

There's also some pre-sale going on if you read the below post well.

So, did you finish packing yet?

http://news.cheapflights.com/airlines/2009/07/cheap-caribbean-49hour-49-allinclusive-sale.html