Firefox's "awesomebar" is definitely a nice addition. But I don't use it because i can't control it at all. For example, let's say I entered an address and I mispelled it, but pressed enter anyway. Well, I'd like to remove that entry from firerfox's "memory". Also, I may want to remove other addresses from there selectively. There's no way to go in there and start messing around with everything. So i don't use it for that reason. I rely on Linkman for bookmarking and finding addresses I want.
It's just like the Outlook address history which I have cursed pretty thoroughly in a thread here. You can't go in the place where all those addresses are stored and mess around. Oh man, don't even remind me. I absolutely HATE the way outlook/exchange handles contacts, addresses, displayed names, cc, ...basically anything that has to do with keeping the contacts inside the program. Their implementation is horrific.