When saved as an application in Script Editor, this will convert any pdb files to txt, then delete the original pdb file. Use the following scripts to do your conversions.In fact, to use these droplets, you don't need to get the AppleScript on the above site to work (just compile xpdf and text2pdb), but it is very useful so I'd do it anyway.
Make sure during this you pay attention to: This is how to create AppleScript droplets to convert text, PDF, and Word documents to. In addition, for reading PDFs as text, the conversion must respect the column flow in multi-column PDF fliles (or else you end up reading across, rather than down, the columns in your text file). This requires quick and easy inter-conversion from. I often like to read and edit documents, articles, and papers on my Palm device (using the excellent QED), and then continue back at home on the Mac.