Scared of the Y seam?? I remember seeing a thread or two about them a while ago...I think included in a block of the month project. I was curious if there was a descent visual explanation out there somewhere and did a search this morning. Gotta love youtube.
This first one goes quickly
http://www.youtube.com/watch?v=TQA28NnH_S0&feature=related
The second is far more in depth, but the camera is a little shaky
http://www.youtube.com/watch?v=pqWEqbd9tMM&feature=related
but if you bear with it, I think you'll find it helpful.