It's not pointless, Alpine are working on a lead that can charge the new 4th gen nano, it's Apple's fault, because it does mean almost all stuff that works with an iPod dock connector won't work properly unless it's made specifically for the 4th gen nano. Your nano will still play, just won't charge, so it's life will be just like what would use it like if you used it walking around.
Literally all other iPod works like they are meant too.
I had my mates 30GB video on it tonight, I've had an iPod Touch on it, and a 1st and 2nd gen nano, also the latest 120GB Classic works as that's what I'm using on it now.