I haven't tried this but thought some here might be interested:

Welcome to Free OCR

Free-OCR.com is a free online OCR (Optical Character Recognition) tool. You can use this to perform OCR on any image you supply.

This service is free, no registration necessary. We also do not need your email address.

Just upload your image files. Free-OCR takes either PDF, JPG, GIF, TIFF or BMP format.

The only restriction is that the images must not be larger than 2MB, no wider or higher than 5000 pixels and there is a limit of 10 image uploads per hour.