I always keep using my Mac to share my net connection to access it on my iPod Touch or on my friends Hero. On a Mac it is an extremely easy affair.

To share an internet connection over Airport, you will need to be connected to the internet by either a wired ethernet connection or by a cellular card. I am connected to the internet through my college’s network.

So how do you share your Internet connection using Mac OS X? See the tutorial below
Open the preferences pane and click “Sharing”:

Click on the name “Internet Sharing” which will bring up the internet sharing information to the right of the preference pane:

Choose the type of internet you want to share (I have “Built-in Ethernet” selected to share):

in the “To computers using:” section check the box labeled “Airport”:

If you want to name the network, set encryption or a password, click “Airport Options…”:

Once you have configured the settings, check the box next to “Internet Sharing” on the left and you will be prompted with a warning: “Are you sure you want to turn on Internet sharing?” Click Start.

Now your internet connection should be shared. In place of your normal WiFi signal strength indicator you should see the icon on the right.