Yeah, Entry Express is the best list. If you click on "hunt test" on the left side of the screen, it gives the list of all the hunt tests. You can click the different columns to sort by state or date of test. Good stuff. Now if only the clubs here in Oregon would get it together and get their tests signed up (just one so far, but I know there are more coming soon).
Jeff T. gave you the link to the events search page on the AKC site.
The other site that I've found good info is Working Retrievers Central's hunt test calendar page.
The other option is to search for your local clubs and look on their websites.