The only affiliate program I ever really liked was Shutterstock's, but since it was drastically scaled back it's all but worthless now.

So the only programs I support at this point are those that will bring in customers to sites that I hope will succeed. Presently I only support the Stockfresh affiliate program. It's nothing spectacular, but it is simple and straightforward. 10% of any purchase a referred customer makes.

I think the OP means "partner" programs, not affiliate programs.

Sorry if I wasn't clear. I meant were one site that a photographer submits to makes sales or uploads on other sites that are not the site were the photo was originally submitted to...

Ah. Got it.

Are there any good partner programs out there? I doubt it. I used to think Thinkstock was decent, but obviously we've seen recently how that can go bad. They're all flawed. Just some less than others. The very nature of these programs is to disconnect from the mothership and get images out to as many other potential buyers as possible. In doing that, things get lost as images get further and further out from the source. At best, it results in accounting errors like Thinkstock. At worst, you get programs like DP where the company doesn't even know who some of the partners are.

A good deal of information about partner programs can be found here.