Automatic filtering is annoying, but there are plenty of tools that will scan your resume and tell you what keywords they find. I once spent weeks crafting a catchy looking resume with a fixed width font and ascii art. It didn't get any responses, and I didn't understand why until I put it through one of these scanners and realized that the program I had used to save the PDF had strangely encoded all of the text in reverse, so I wasn't passing any of the automatic filters. The takeaway: test your resume with a scanner!