Well here's some criticism of Kent Hovind - from creationists.
Missing Link
| Answers in Genesis
Here's an extract :
"When an attempted critique of this AiG article appeared on Kent Hovind’s Web site, AiG was somewhat surprised (and disappointed) to note that it frequently and significantly misrepresents and/or misunderstands the statements and positions made in our carefully researched document."
Here is what talk.origins has to say about Hovinds offer - with an explanation of why it should be considered fraudulent
Kent Hovind's $250,000 Offer
Here is a letter from someone who tried for Hovinds challenge
Account Suspended
And another person who tried wrote this :
http://www.geocities.com/odonate/hovind.htm