Ahhh, I frogot Mandrake 10 came with a partitioner.. that can handle windows...
defrag yeah.. keeps files together instead of in fragments.. and you may get a bit of extra space outta it.. so I guess it's worth it.
the Mandrake partitioner is just parted in the background, I think.. but I haven't heard of any major complaints about it.. so give it a go.. see how it works for you
Also, if you have two computers.. hope into #tfp if you have any questions.. There always seems to be Linux person or two.. in there.