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This would be a great tool to have... if it was actually a good-quality piece of software.
Unfortunately, PDFpen has pretty much always sucked. I bought it during the 4.0 era and while the developers seem to roll out new updates several times a week, it's still a buggy, crashy, glitchy, clunky and frustrating piece of software. It supposedly can do a lot, but it seemed like every time I'd actually make some progress on a PDF file, PDFpen would decide to crash. I suppose the developers are thankful for the auto-save feature in OS X Lion... less work for them to do, they can ship the same old buggy software... but they can charge you for that update!
Worst of all was that the difference between the last 4.xx version and the 5.0 version was a few minor improvements (that were of course buggy) but many long-standing annoyances and bugs/stability issues present during the entire 4.x version cycle remained uncorrected.
The funniest part of all of this is that the much-improved Preview.app in Snow Leopard and Lion has nearly as many features as the $$ PDFpen... but they ALL actually WORK. And of course, Preview is included with the OS.
Save your money and if it's OCR you're after, buy a real OCR product... use Preview.app for 95% of your PDF needs and if you really need that last 5%, save yourself some frustration and buy Adobe Acrobat Pro X. Because as annoyingly craptacular Adobe products seem to be these days, Acrobat Pro at least works, and compared to PDFpen is a joy to use.