Hi
There are a whole lot of webview tutorials on youtube I think the one I liked best was from simplesdk, even though most are for the iphone you can use the same coding for the ipad. You just need to make sure when you are in the second window wher it says (new product) somewhere in the middle it will say product and there will be a little dropdown you just need to select ipad from the default iphone.
Hope it goes well
David
You could by using UIWebView, but for a great UI I would recommend converting your website into an actual Objective-C program for a great touch experience, sort of like what CNN did with the CNN iPad app.