Thanks, Dan. UsePlus looks interesting, although if I can find a solution that doesn't require me to pay for it, that would be preferable.
I'll take some time this coming week to look more closely at it.
WRT ASMP, my pre-photography background is in business and I have a very solid grounding in copyright, contracts and licensing so that information is less pertinent for me but would be helpful to many. I'm also located in Canada so there are some differences in relevant laws.