#37 is great, it is simple and elegant and it looks good. Honestly I doubt we'll be able to use it because the bird is a predator etc, can we make it a peace dove? Might be hard for a dove to carry a ball though..
#30, 36, 29 and 28 are great concepts, my only concern is that the banner makes it difficult to print the name in different ways. For instance, on our website the emblem is seperate from the lettering. It could still work though, so its definately got promise.
This logo is now a 2 colour logo, just in case the colour was a concern, also if the flags of the world are too specific. ie you don't want to show one particular country, we could imply flags and make them up.