Amazon has released an update to its Kindle application for the iPhone, iPod touch and iPad. Kindle 2.1 adds larger fonts and more font sizes for iPad users, improves navigation between home and archived item sections on the iPad, and adds a download progress indicator. The new version also provides iPhone and iPod touch users with the ability to search inside their Kindle e-books; the release notes indicate the search feature will be coming to the iPad version in the next release. The next version also promises a built-in dictionary and the ability to look up words in Google or Wikipedia. Kindle 2.1 is available from the App Store as a free download.