Originally posted by: LiQiCE
The new '04 TL is definitely a nice car.  One of the common problems with the '04 AT is the tires though.  The tires that come with the AT have a tendancy to cause the entire car to shudder and take away that smooth ride that the TL provides.  If you're worried about the tires, you should be more worried about the crappy Potenza tires that they're putting on the AT version versus the tires they're putting on the 6spd.  Although I've heard of dealers trading people's Potenzas out for Bridgestone All season tires if they complain enough about the shuddering.
Also, it is possible for the Accord/TL platform to take on AWD.  It would be the same system that the CRV uses (which still has a FWD bias).  I have no idea if it will come true or not, but I've heard rumors of a 300hp TL ("Type S"?) AWD version and a Turbo AWD TSX for the future.  (The AWD on the TSX is definitely possible since the European/Japanese Accord, aka TSX, has the option for AWD).
I would highly recommend you checkout 
www.acura-tl.com and 
www.acura-cl.com to see what other '04 TL owners might have problems with.  Since it is the first year for this car, I wouldn't be surprised if there were other minor problems... I know the tire shuddering is the big one right now.