Service Collaborate for Graphic designers?

I am a graphic designer using Photoshop and constantly sending graphics and receiving revisions through pain-staking email messages back and forth. I am looking for a basic service that I can use that allows me to throw any type of file format graphic on, send to my client and without them needing to log in or sign up, be able to comment, draw and highlight parts of the graphics et. . It would be nice to have version control also so I could always look back to see what they needed five revisions ago. i don't need anything with tons of features, I just need a good stable collaborative platform to be able to to this on.

Any suggestions? -Thanks