There's no way (currently) to get Dynmap (what powers the live map) for single player. However, if you really want it you can locally host a Bukkit server and play your single player map on there.
There is mods there let's you see the entire map like dynmap, i just can't remember what they was called
The thing that i'm talking about is like Slime finder. You give your world seed and get a map over the world. =P