Using cycles, I suddenly can't render anything!

I’ve been working on a scene, I’ve added a new object to the scene, and–suddenly–no layers are rendering. I checked the layers for teh scene and all the layers I need are checked. I even previewed the render for the 3D view and it renders just fine. I tried moving objects to different layers and only rendering certain layers, but I keep getting a gray image as if nothing is in the scene.
Any ideas? Thanks in advance.
I’m willing to post my blend file, but i forgot the site that everyone uses to do that (something akin to pastebin).

Check outliner for objects set as non renderable
Check video sequence editor for any video overiding your render (Render / Post Processing panel)
Check you have set the correct camera in the Scene settings
Check in the Object / Duplication settings you have set all objects to None

I’m willing to post my blend file, but i forgot the site that everyone uses to do that (something akin to pastebin).
http://www.pasteall.org/blend/ or one of the gazillion other file host options