I've been looking for the same thing myself, though it does depend on what one's interpretation of 'manager' is:
I used to use powermarks which was pretty good http://www.kaylon.com/power.html
You can upload your favorites to The Web and retreive/update from home/work/where-ever.
I've been using approcket from http://www.candylabs.com/approcket/
It takes a lot of getting used to and uses far too much memory (that's .net for you) but it works very well for calling up any favorite, program or even an mp3 using the keyboard alone. I think it even learns a bit too and moves what you use often to the top of the list of possibilites.
An alternative to approcket is 1st turborun http://www.turborun.com/
Very small memory footprint, the free version does URLs only and might be just what you need. The paid version is not as versatile as approcket but it is small.
With both the above, the idea of typing a key combination and a couple of letters to get to the app/url/mpg you want is extremely attractive.
Bookmark Buddy and it's kin are just too fiddly for me and don't really improve a whole lot on what any browser provides. Linkman is a similar program.
I'm still on the lookout for the perfect manager, something like approcket with the size of 1st turborun and the ability to call upon an am-deadlink http://www.aignes.com/deadlink.htm
Please excuse any meandering.