I'm having a lot of trouble adding PogoPlugHD to my iPad. It says "Unable to download Application. PogoPlugHD will be available for download when you login to iTunes Store on your computer".

I've done this and in the end had to redownload the app to my Mac but when I sync my iPad the App appears - as I've checked it to be copied to my iPad from within iTunes - but then after sync it simply gets unchecked and therefore doesn't appear on my iPad!

I've successfully added the iPhone version to my iPhone with no such issues!