If I shoot 720P 50 and want to incorporate som 720P 25 slo mo footage, how do I go about this to get the best results?
(I use FC)

Before I have usually shot 1080P and just popped the slo mo footage down on the timeline, but for this project I will shoot a lot of different action sports and would prefer to have the bulk of the footage in 50P.

Any thoughts?

EDIT: I just shot 3 different shots 720 50p, 720 25p and 720 slo mo. I put them all on a 720 50p timeline and no need to render.
The 50p obviously handles fast motion better than 25p.
The 720 25p 50 frames a second seemed fine in the time line, but I guess something has to "be done" to the shot in FC to make it play in a 50p timeline, anything that affects the image quality?
I´m on my laptop so I can´t play it back on a proper monitor for critical viewing, but it looks good so far

Update:
I just made a QT file of the 3 shots and played it back from my WD HDTV on my 42" plasma and they intercut nicely. 50p showed less stutter and the slo mo played very well.
So I guess I stick with shooting this project in 50p and just throw the slo mom on the 50p timeline.
The slo mo certainly intercuts better than with 1080 25P

This also may be of interest:

Final Cut slow motion at various speeds on Vimeo

Alex's tests using Compressor's Optical Flow to retime existing clips.