I have found it helpful to print an indexed grid on paper when I layout Meggy screens. It provides a nice quick reference to screen coordinates. Actually, I print out whole pages of these nifty little grids and liberally attack them with colored pens, which makes the programming much easier... for me it does, at least.

I have zipped up a collection of jpegs and an Adobe Illustrator file for anybody who might like to give them a try.

http://codefun.com/Junk/Meg_Grid.zip

I also put a scan in there of the master grid I used to animate babies falling from a burning building in Fireman Fireman to give you an idea of how helpful these grids can be. I hope you find them useful too.

These are great, thanks!
I especially like the numbered ones as I have found myself counting quite a bit while programming

Yes, thanks very much for these(and for the Fireman example). I can't wait to put them to good use, its nice not having to count sooo much.