FYI - In case you haven't see the iPad AppAdvice app - I'd highly recommend it. Every day, they post about 5-10 apps that are free for a day... You can really build up a nice collection of paid apps for free by checking the AppAdvice app daily! I believe that you can also get the info from the AppAdvice web site, but the iPad app just makes it that much easier... Here's a link to the lastest "free for a day" apps - enjoy!
http://appadvice.com/appnn/2011/05/ios-apps-free-falling-fred-turbo-grannies-mental-mouse
http://appadvice.com/appnn/2011/05/ios-apps-free-falling-fred-turbo-grannies-mental-mouse