Heh, it's funny that this thread about PdfMasher shows roughly at the same time as this other one about fairware.
I'm the author. It's a fair review, thanks, but there's two things I'd like to point out.
1. The keybinding to set selected items as ignored is "i", you don't have to click the button each time. I guess that a "del" keybinding would make sense as well.
2. PdfMasher doesn't do OCR, it only deals with text information within the PDF. If your PDF is "image only" (if you can't copy/paste text in your pdf reader), PdfMasher can't process it.