Check out this fun website, iPad Peek, that lets you see how your website will render on an iPad. Although I use Squarespace to host my site, and it does a good job of optimizing it for mobile viewing, it was interesting to me to see how the ads and widgets and embedded content I've added to the page would render. Just remember when you enter your own URL to disable your browser's flash plugin since the iPad won't really play that media on your page. You actually need to trick the browser into thinking it's got the iPad webkit version to get a taste of the real experience. Mashable explains how to do that if you don't know.