Subversion for Flash developers?

I'm looking for some good case studies on development groups which are using Subversion for Flash version control. Best case would be groups of 5 or more collaborating on projects.
I'm less concerned about the actionscript-only side of things.

What I'd like some commentary on especially is the process of collaborating on binary media files. Our organization is accustomed to the pessimistic locking paradigm in which only one developer is ever working on a given file. This even goes for ascii files as clearly more and more code is being externalized. Developers who are used to working this way are afraid to switch to a copy-modify-merge paradigm for obvious reasons and our organization is no exception. Many e-Learning developers come more so from the designer slant so programmer's tools like version control tend to be less familiar.

So.. who is using Subversion? What type of industry are you in? What client did you select? I am leaning toward Tortoise as the client since it should allow for an easier transition due to its integration with Windows Explorer. This migration will go hand-in-hand with an overall move to more of a programming-focused development paradigm while still maintaining the creative spirit and integrity of our iterative process. That means a completely object-oriented framework, external code editors, and a clearer delineation beteen 'media/design' and 'development'.

I have been attracted to Subversion as a tool for e-Learning development ever since a friend on the East Coast presented it to me. That same year I presented the idea of Subversion as a Flash version control system at the e-Learning Guild DevLearn conference. I was relegated to a small room and attendance was, let's say, moderate.

Its advantages [from my perspective] over more common "windows friendly" version control systems are  as follows:

• Platform independance (server runs on any system, there are a myriad of clients)
• Atomic commit (like any good database, sending your updates will never fail partway through)
• Flexibility to do either copy-modify-merge or lock-modify-unlock
• Network friendliness [like any good system, but that is new to most designer types]

These major advantages mean a lot to me and will allow us to depend far less on a VPN for collaboration with contractors, freelancers, and across office locations.

Any thoughts are appreciated.