Effective Concurrency: Prefer Using Active Objects Instead of Naked Threads
drdobbs.com
drdobbs.com
What it doesn't really give you, is any superior way to handle transactions between your two actors. You'll still have the same race condition/deadlock issues you would with plain ol' locks/threads.
So on one hand, its a step forward, but on the other hand, it doesn't solve the problem that really needs solving.