I will turn 18 November 4 2008. Will I be able to vote in that election or will I miss it because I won't turn 18 before the registration deadline?
In Texas, you can register at 17 years 10 months, but you also have to register 30 days before an election, so if you were in Texas, you would have a fairly narrow registration window.
In general, there has to be a similar procedure everywhere in the US (though specific details may vary by state). Having a procedure that is imposssible to complete is totally equivalent with denying the right to vote.