I will probably post a lot of little tricks here when I get a chance. I am going to be gone for a week so it will be slow getting started.
My first tip is this... If you're time stretching to correct performance based timing problems... but you run into that problem where maybe you had to combine some takes or bounced some audio and you've run out of "dead space" to work with... you can do the following
Double click in an empty space within the track, this creates an empty event. (cubase 5 only). Now, cut one bar in front of the overlapping audio, and one bar behind. Now delete the outer pieces, and then drag a box around the event left behind. Bounce selection. Now you've got the same audio you recorded, but with an extra bar of silence in front and after the audio. Next, cut this event back down to its original size. When you open the sound in sample editor, you'll have dead space to work with again. this will allow your stretching corrections to not interfere with the beginning and end of the audio.