Not really new concepts, but do not think of bookmarks in a File Manager is the same as a WebBrowser.. There are used in completely different ways.
That's a new revolutionary concept of its own right there, at least to me. I can't imagine what different ways you have in mind but it will be interesting to see them when they are implemented.
With the disc sizes these days the hard drive easily ends up almost as complicated to navigate as the internet, mine certainly does. The difficulty to find things in your own computer is the same as on the net, a slightly smaller difficulty but still the same kind.
Personally, the plain old bookmark functions would be enough for me, the same as in a browser, though I might change my mind when I get to see the advanced ideas you mention.
I'll have to look into the ways of creating my own menus. A lot of things I haven't had a good enough look at yet. It's possible that most of what I need can be done already in slightly less obvious ways.
I hope you keep up the good work! The more I look at MultiCommander the more I like it!