I have finally gotten around to doing some serious license remapping. Ironically, here in the US I think we're going to get off relatively easily because so much of our data is imported from a PD source. Any contributions from decliners are generally limited to trivial way splitting and/or improving geometry which can be redone easily from Bing or USGS imagery. I am primarily concentrating on the interstate system right now.

I wrote a blog post about my initial efforts which may be of interest to others:
http://ksmapper.blogspot.com/2012/01/license-change-mapping.html