I have a bunch of images, all the same size. I'd like to fill the screen with the images side by side like a grid. Is there a quick way to take all the images and put them next to each other, without having to move them individually by eye?

You don't say what you're working in or what platform. But if you're on a mac you could try

Noise Industries - FxFactory – Plug-Ins for FCP, Motion and After Effects (http://www.noiseindustries.com/fxfactory/)

They had a good video wall plug in that I used some time ago.

Here you go.... LME COLLECTIONS (http://www.little-men.com/Amazing_01.html)

They are easy to set up... just put your own pics in the folder...

I have a bunch of images, all the same size. I'd like to fill the screen with the images side by side like a grid. Is there a quick way to take all the images and put them next to each other, without having to move them individually by eye?

There is a script by Lloyd Alvarez (http://aescripts.com/layers2grid) called Layers2Grid on aescripts.com that does exactly what you ask for. I purchased a copy and have used it many times, works great.