Bandwidth is not the issue - the issue is CPU. h264 (HTML 5 Video) is rendered on an iPhone using hardware and works fine.

If you're trying to estimate the size of project for budgeting purposes, then function-point counting is a useful method. Over time you can learn how an organization performs and your estimates will become more accurate. If you're trying to estimate for the purposes of visibility then don't—you're better of using one of the agile development methodologies.

Why can't a solution like Greasemonkey work?