[CentOS] Resizing a fat filesystem on a USB partition

>> AFAIK, there is no way to "resize" any FAT partition.  You have to
>> delete both partitions and then create a new one.
>
> I thought the CD installer came with a utility to resize FAT partitions 
> (albeit in MS DOS)?  And this isn't possible in CentOS it self?  :-/

Have you looked at the gparted LiveCD?