Thanks for all the kind comments everyone. It was really pretty easy... I just got a bottle of something like this from Home Depot. It is meant for wallpaper borders/edging, but the built-in roller worked great.
And actually, I think it looks better than the pictures can convey. After putting paste on the back, I kind of buffed out the front of the poster with a dry towel so it really stuck down well. That allowed poster to take on the texture of the wall and really look like part of it, not just sitting on it if that makes any sense. This picture might show it better than I can explain it...
True wilding-style, not just more pictures on wall (which there are many). Now, if you do them crooked or overlap them it might look even better depending on what you are going for...
Be warned, some of the posters were thicker and not as glossy (Kill Bill, for instance)... those didn't adhere in the same way. They still look good (and I would use them again), but I think the glossy thin-stock ones turned out best. Also, be careful when you are buffing them down as paste will come out the sides. Wipe off excess and then clean off the front of the poster with a wet sponge (and the adjoining poster you just slobbered all over). If you don't most of the poster will look glossy and nice but the borders will be all snotted up. I also started with a painters tape stripe along the right side so I would get a straight line and to keep excess paste off the wall. However, when I got the left side I just lined them up with the others. It turned out ok so long as you wipe the excess glue off your wall/paint as well. Any more questions... just let me know.
It really did turn out nice though... I often walk by and stop, wishing I did the whole wall! That would have cost a fortune though as these 29 cost me $100 shipped from Japan. Definitely worth it if you want a really cool accent though...