I've done video wall techniques dating back to the original 5.0 version of this book, and in my “Down & Dirty Tricks” column in Photoshop User magazine, but this version (which I saw used in the contents page of Entertainment Weekly) is the best I've seen yet. It has a number of steps, but it's not hard to do, and it looks pretty darn cool when complete.
Quick Tip: Ruler guide trick
Any time that you're dragging out a guide from your ruler, you can change its orientation as you drag it (just in case you meant to grab a horizontal guide and instead you accidentally grabbed a vertical guide. Hey, it could happen). To change the guide from vertical to horizontal (or vice versa), press the Option key (PC: Alt key) while ...