app-admin/dosfstools supplies fsck.{msdos,vfat} and mkfs.{msdos,vfat} these utilities are handy if you're using the livecd to recover a windows partition, they are also handy if you need to fsck your windows partition before copy stages or binary packages from a windows partition to your new Gentoo Linux partition.
will be on all livecds built on or after 2002-12-28. Thanks :)