FODA, you can download the 1.5 RC2 here:
http://smw.72dpiarmy.com/smw-bin-1.5b-beta.zip It has fireflower, star and 1up powerups. Making mario grow into big mario has some complicated collision detection things that I still need to work out. Maybe next version... BTW, mario jumps just as high as you hold the jump button in 1.5 (the physics still need to worked out with this, though. How much further should mario climb after the jump button is released?)
Thanks guys for taking the time to discuss this. That mario jump graph BoltR made is awesome. I took a close look at it and it looks like mario moves pretty irregularly. He it at the apex of his jump for 6 frames then falls 1 pxl, 1, 2, 2, 3, 3, 3, 4, 5, 4, 4, 4, 4, 4, 5, 4, 4, 4. Which I think means his terminal velocity is 4.2 pixels/frame and non-constant gravity but somewhere around 0.5 pxl/frame/frame.
I'm wondering if most of mario physics is like this... Maybe it would just be better if you guys played RC2 and let me know if you think the physics should be tweeked of if it is just good enough.