I finally got a chance to try out my Printable DM Encounter Manager (note: updated version 2 link) sheet in a gaming session today.
In short, it rocked. I was really happy with how it worked. Everything I needed to run a combat (beyond the monster stats) was contained on the page. This makes DM'ing fourth edition really easy, because it's got spaces for everything you need organized in a clear, accessible way.
Now, we've only tried it with 3rd level adventurers, so it hasn't been tested with the higher-level combats, so perhaps there are elements of high-level combat that I'm leaving out here. But so far, it's a really handy reference for adjudicating. Just print out one copy of the page per encounter, fill it out before the game, and you can hit the ground running.
There are a few minor changes I need to make. When printed in black and white, the hit point tracks and the "Init" word in the initiative tracker are too dark and get in the way; I intended them to be lighter so they could just be written over and easily read. I'd also like to reduce the size of the rows and add some more whitespace between them, to make it clear which pair of rows go with which monster.
Do you have any other suggestions for improvement?