Basically, I had a filesystem (/home) that the installed said it could (and
would) mount. All of the other filesystems (/boot, /usr, /var, etc...) were set
to be formatted and mounted, etc... Everything proceeded fine until it tried to
mount /home, which failed, possibly because my /home is JFS (please PLEASE
support jfs).  However, I could live without that for a bit, but what went wrong
after that is bad.  None of the other filesystems were mounted (/usr, /var,
etc...) except for / and /boot.  Installation attempted to proceed but ended up
running out of disk space. 

Suggestions: a "Do you want to continue anyway?" box if an error occurs during
partitioning/format/mount and b) do /not/ continue if one of the filesystems
required (such as /usr or /var or /opt) was not able to be
formatted/mounted/whatever.