Dav3.us, that was a really good point.
for differences......
.com is the most desired name to have, harder to get, then .net then .org then .us and .info but I think that is changing I have seen some .net sites that were ahead of .com sites on Google searches.
I used to think that .org was just for religious sites but that isn't right either
or else changed and no one sent me a memo....
I think like .us would also show that it is from the US originally? I think some countries do that anyway....