Also..another easy edit is to select the "Body" of the character in Poser 5 (It will be a big circle around the character) Make sure your Translation and Rotation are set to the same as your T-Pose (frame 1) Usually this is "0".
You can also select the hips and make sure that your spline starts at "0". Use the "Move Forward" and/or "Move Left/Right" (with feet IK off) to adust where your anim starts in relation to your T-Pose.
You can use the spline editor (double click on the corresponding element in the Frame Editor to bring it up). Then hold shift key and drag across the appropriate Rotation/Translation spline to highlight the entire spline (It will shade black). Then hold the ctrl key untill the arrows point up and down. Then move the entire spline. This works great when the "Drop All Character Frames to floor" Python script blows your edit.
One of the things I love about Poser is the multitude of ways you can accomplish the same thing by different approaches. Motionbuilder is like that as well.
Note: for
SL uploads make sure your T-Pose is frame "1" and orientated properly. Also make sure "Loop Interpolation" is turned OFF. For 2-3 frame poses this is not an issue however. I typically only use 3 frames for a pose and loop it on upload.
Hope this helps