802.11G connects to other devices of similar or higher specs using a frequency of 2.4 GHz with atypical throughput of 23 Mbit/s and a potential maximum of 54 Mbit/s. It has a range of about 35m (around 114 feet)
802.11N connects to similar (or higher (not currently available)) using either 5 GHz and/or 2.4 GHz with a typical throughput of 74 Mbit/s with a potential maimum of 300 Mbit/s (using 2 streams of data) with a maximum range of 70 m (230ft)
802.11N is yet to be officially set as the standard, and probably won't be until the end of this year, but several manufacturers have already jumped on the 802.11N bandwagon using the second draft of the standard as their basis.
It won't make a difference to your internet speed, but could make a difference to your internal network speed. The reason for this is that your speed is linked to the slowest part of your network, and that is your internet connection.
I liken networks to driving on a single track road in the Highlands of Scotland. You could drive your Ferrari at 100mph all the way to your destination,(not legally of course, but we are talking hypotheticals here!). However, if you get stuck behind a lorry, you can't overtake, so you are stuck at driving however fast the lorry is going.
-------------------- "Only the stupid don't ask questions." My piccies
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