how to convert a case-insensitive FS to case-sensitive on MacOS X 10.6.1

I have a Snow Leopard with a case-insensitive file system. I wonder is there a way to convert the FS to case-sensitive without having to format and then reinstall the whole OS. In Linux there are utils like parted that enable to change the partition FS (at least ext2 to ext3 for one), is there something similar for Mac OS X. I mean that case-sensitivity seems to be a small option to change, does it absolutely require a format+reinstall of hd?

I haven't used it, but iPartition claims to be able to convert in-place between case-sentitive and case-insensitive HFS+ formats.