This is pretty cool:
"Kleptomania 2.4 allows to capture and process text from any (even clipboard-unaware) application. Copy text onto clipboard, launch internet browser or email editor, sum numbers, count a number of words/characters. Process text of folder trees, file lists, database reports, text content of messages and dialog boxes, menus, status lines, visible text of legacy systems, and more. Kleptomania does not rely on any data communication scheme behind the scene. Uses OCR and delivers ultimate text capture and processing abilities."
A similiar program is Textract, which can be found on http://www.download.com
It would be nice to find free/OpenSource versions of programs like this, however.
See also Windows