...the pie chart tool, at least in CS3 and CS3, does create individual segments (you need to ungroup it first)...
...the polar grid tool does not create individual segments, so you would have to construct those manually...
...to create duplicate objects around a central point you need to rotate tool with the copy function. When you have done one copy, pressing apple/command + D will then created another copy from the last, using the initial rotation values used, and so on until you end up back at the beginning...
...apple/command + D is also useful for other step and repeat tasks...
Andrew