I've actually been doing some work with various OCR tools the past few days. Tesseract and Ocropus didn't work very well for me, but I don't think mine is the intended use. I have a need to identify images that contain text (which could be on top of a complex background) and most OCR applications are better suited for reading scanned documents. So far GOCR has produced the best results for me.
I found an article a couple weeks ago comparing a few OCR applications for scanning documents that someone might find interesting: http://www.linux.com/feature/138511
OCR quality is heavily dependent on font type, font size and contrast, but for many typed documents Ocropus and Tesseract do a pretty decent job.
I tried these out for converting image-only PDFs, but the installation was getting ever more complex and unstable. I made a time-is-money decision and purchased Vividata - *nix based command line utility - which is a shame as I would've liked to have got these working. Almost all the other products were Windows based - urrgh!
If anyone has a different experience, I'd be pleased to hear from them...
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I found an article a couple weeks ago comparing a few OCR applications for scanning documents that someone might find interesting: http://www.linux.com/feature/138511
OCR quality is heavily dependent on font type, font size and contrast, but for many typed documents Ocropus and Tesseract do a pretty decent job.