Iphone 3g s :}

I just got one and I forgot to ask if you could use your ipod songs as a ringtone?? If so how can you please and thank u

in iTunes, make a new playlist with all your songs, and the songs that can be turned into ringtones should have a small picture of a bell next to the time column. Click on the bell picture, then you should be able to select what part of the song you want as your ringtone. It's .99 cents.
I have an iPhone 3G, not 3Gs but it should be the same.
hope this helps