I just got the Allears newsletter. Embedded in it is the following regarding Airtrans new policy changes....
AirTran Airways will begin charging passengers $10 for a second checked bag effective May 15, 2008. For each fare-paying customer, the airline will allow one checked piece free of charge, with size and weight limitations. The excess baggage charge, for other than sporting equipment, will be $50 for each piece after the first two bags. Additional charges are applicable for bags exceeding the weight and size limits. Oversize baggage, with dimensions from 62 to 80 inches, will be accepted subject to an oversize baggage charge. Baggage with dimensions from 62 to 70 inches will be subject to a fee of $50. Baggage with dimensions from 71 to 80 inches will be subject to a fee of $65. Baggage over 80 inches in dimension (with the exception of some sporting equipment) will not be accepted.
There's also the following link for more info:
AirTran Airways - Carry-On and Checked Baggage Policies