Some pools forward tx fees, most keep it.
Currently tx fees revolve around 0.05 BTC which is 0.1%, I don't think they're something to worry about now. They definitely will be in the future.
sorry Meni
TXN fees are increasing substrantially
Ozcoin is regularly receiving TXN fees between 0.1 and 0.6 BTC per block, yesterday we had a good one at 0.8935006BTC of TXN fees
6 of the 24 pools listed here
http://blockorigin.pfoe.be/top.php pay out txn fees as shown on
https://bitcointalk.org/index.php?topic=104664.0TXN fees are paying more than the Namecoin component of Merged mining on Ozcoin, I think they are well worth worrying about