in a word, no
in more words, probably not. The N routers tend to have Gigabit switches built in which if you're planning on sharing large files between machines on your network might be handy but if you're just sharing the net then you wont notice any difference.
So it's more of an upgrade for wireless users... and no speed increase for wired, shame..., thanks for your reply.
Well there is a speed increase for wired connection, most G routers have a 100mb/s connection and most N have a 1Gb/s connection on the wired side, but if you're just sharing an internet line then there is no advantage.