You may have noticed that printing in Internet Explorer 7 has a new feature – "Shrink to Fit". In some situations, such as when pages are in an iFrame, "Shrink to Fit" is always applied by default. For general web pages this feature may be appreciated, but in a web application where developers want to control the layout of the page, and perhaps generate reports, we do not appreciate IE7's changing the print layout at all.
If you have not been challenged by this behaviour yet, don't worry – you will! And when you do, here is the solution.
document.execCommand('print', false, null);
Or if you are wanting to print a document inside an iFrame you can use something like:
window.frames(0).document.execCommand('print', false, null);
Note: This solution is for Internet Explorer 7 only – I leave it up to you to do the browser detection.