Just released and available on iTunes!
Rivers in California, including the American, Kern, Trukee
12 rivers in Colorado including; Animas, Frying Pan, Gunnison
7 rivers in Wyoming including: Big Horn, Gallatin, North Platte
It also works on iPhone OS 2.0 now!

I'm definitely going to check it out. If it has Idaho and Washington rivers I'll get it. How about an app with a picture of various flies or better yet adding a picture of the flies The Hatch is identifying, and tying instructions for that fly?
The app already has Washington and Idaho rivers actually. For Idaho it has information on the Big Lost, Big Wood, South Fork Boise, North Fork Clearwater, Henry's Fork, Lochsa, Upper Salmon, Selway, Silver, and South Fork Snake.
Washington has Elchoman, Elwha, Green, Hoh, Kalama, Samish, Skykomish, Snoqualmie, Wynoochee, and Yakima.
I am considering adding pictures and more information on the fly's. It will require quite a bit of rewriting, but may well be worth it. Thanks for the comments
I'm BRAND new to fly fishing,,, just went on my first trip and loved it! So now I'm hooked. Do you have any information on Utah or Maine? I'll fish in these 2 states along with Colorado the most? Plus the pictures would be a BIG plus for us Novices! I'd pay 2 or 3 bucks for pictures. Thanks
Utah will most definitely make it in the next update. I'm working my way east.
In fact after the next update, The Hatch will have information for at least: Washington, Oregon, California, Idaho, Nevada, Utah, Montana, Colorado, Wyoming, and New Mexico. I'm sure I will get some more states in before the update.