I do recall reading earlier about the folks at the hotel who hired the busses, only for them to be seized by govt folks. The hotel hord then went to the superdome, and caused some major problems because they wanted to be boarded on the next available bus out, but were told they had to wait just like everybody else. If I recall correctly, they pooled their money to pay the $25000. TP had some info on this, as did WLTV.
I thought there was some rumblings that the commandeered bus story might not have been everything it was cracked up to be:
http://instapundit.com/archives/025399.php