Funny little sound!?!

:shakehead Hi.I have owned a '05' for about a year,and have been expierencing a funny little popping sound when I first take off. I noticed it about a month after I bought it. At first it was barely noticable. Now it is very apparent. I took to the dealership and they thought it was the motor mounts. Not it... Now they think it's the transmission or the clutch.It's under warrenty but I'm conserned. Has anyone had this expierence?? Still love my mini!

Popping sound is uusally suspension related.