What is frame rate with 1920x1080/60p?

I'm currently shooting and editing HD 1920x1080/60i (interlaced format, 29.97 frames/sec).  To reduce motion artifacts, I'm considering a change in my workflow to HD 1920x1080/60p (progressive format), but first I must update my understanding of this newer format.  Question 1: What is the frame rate for this format, 30 or 60 frames/sec?  If the answer is 30 frames/sec, why is it called 60p?  Question 2:  How many complete scans (combining odd and even lines) are produced per frame?  Question 3:  Would a Master File exported from Final Cut Pro X (by default, a QuickTime movie file) be progressive or interlaced?  Question 4:  Would iDVD v.08 accept a progressive movie file for making standard DVDs?
Your answers to these questions are very much appreciated.

Thank you, Tom Wolsky and Karsten Schlüter, for your fast replies!
Tom, regarding my Question 4:  Are you sure that the latest version of iDVD can accept progressive 1920x1080 QuickTime movie files at 59.94 frames/sec?  As you may know, iDVD is no longer supported by Apple, and their Technical Support is unable to answer my question.  I respect your experience in this area and would like you to advise me in my proposed switch to a progressive workflow.  I can't afford to shoot in a format that will not allow me to make standard DVDs.
Best regards from Interlacer.

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