A lot of people are talking about Google Goggles. That is a search by Image Search in Android. You can take a photo of Landmark, Books, famous artwork and even a Logo by an Android phone. Then it can recognise the image and convert to text. For example, they took a photo of London Bridge and it will do a google search on London.

In Australia, HTC Magic has not a ROM update yet, that is Android 1.5. Google Goggles requires Android 1.6+, so that is not for me to test yet!

Reference Links:
Google Goggles