Does the kind of wireless router make a difference with speed regarding internet connections?

I have a wireless G router. What is the difference between that and a wireless N router? I use wireless for our laptop and xbox 360, what is a good and powerful router?|||Wireless N is for transferring big stuff between your laptop/computer/etc. If your just using it for internet than the g will work just fine and itll be cheaper. Make sure you invest in a good model though, because thats more important than speed.|||hmm..i think there is a difference but idk...