MobileCrunch has this excellent article on the ScanR product, which allows you to take a camera phone picture and convert it into a searchable PDF file.

You need a 1 megapixel or better camera phone (or camera). ScanR will be great for heavy travellers who frequently use whiteboards and want to capture the outputs for later use. You take a picture, email it to scanr, and they email you back an enhanced pdf version.

Best of all it’s free, so check if your camera phone is supported here, and if so, try it out.