Here's something I that I want to do with my Android phone (Galaxy S2, CM9). I'll be happy if someone could tell me whether it's possible, and how.

I often want to transfer files from my computer to my phone. But it's a clunky process. the easiest way for me right now is to use AirDroid, but it's cumbersome. Connecting via usb is cumbersome too, because I need to enable the usb storage thing.

What I really want is this. I want a folder on my computer that I can put files into, and have them automatically uploaded to a dedicated folder on my phone's sd card without any further action on my part. It's important that this won't mean constantly having a heavy program working in the background on my phone, because it's slow enough as it is. 

Any way to do that?