put a URL prominently that takes the reader to your "full" resume online

I'd be wary of doing this. Anything that makes the HR person's job harder is likely to result in them totally ignoring your resume. At the very least, ensure that it's not required for them to find out about you.

And since everyone else is doing it, my CV is here. I ought to update the section on current employer, though ("SONICblue has recently emerged...") .