I'm writing to leave a simple thank-you for the developers.
I started my simple PDF editing needs some time ago using Adobe Acrobat versions 4 and 5, and stopped upgrading from there because of the costs. I've found several means to generate PDF documents, previously using PostScript printing and Ghostscript conversion, and more recently just using the interface to those program provided by PDF Creator.
My needs for editing PDF documents have been rather simple too, in that all I really do is import, export, delete, rotate, crop ... etc. the pages of a PDF document. About the only thing I might consider unique for my usage is the occasional need to extract an image stored in the PDF file (Acrobat worked really well for this).
For working with pages, I've pretty much stuck with some free tools such as: PDFTK Builder and PDFFill. What I found really great about PDF X-Change Viewer is that you provide a graphical/visual means for cropping a page. Most of the free tools I've found only allow you to enter measurements for how far to crop in from the edge ... it just takes too many times doing it that way before it is right. I even looked at how Cute PDF did there cropping, and for a paid product it was no better than the free tools.
I've looked at other commercial tools too that could perform the above, but they end up charging again too much for just the features I need. They start bundling all the PDF creation and form editing features I don't use.
So, when I finally came across your viewer last week, I played with it for a few days and thought it fit my needs perfectly! And, when 3 licences cost only $60, I can't justify using any other free programs anymore.
So, I bid you a simple thank-you and am eager to use image extraction in the PRO viewer once you add it.