All in all, in addition to the Sharp original ROM, there is (or will be in the near future) the Cacko ROM (Sharp-based), the OpenZaurus ROM (Opie-based), and I think you can probably install Debian as well (didn't try that one, I suspect the install to be longer or more difficult than the two other ROMs)
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Actually, Debian is the easy one, because it all runs under the regular Sharp ROM.
You don't need to repartition your disk, or reflash anything.
You can go in and out of it at will. All your existing packages and data are still on there.
The Debian environment is run chroot'ed so Debian's different app and library versions can
coexist with what is already there on the Z. It requires a linux filesystem, but that need not
be a whole disk partition, it can be on a disk file, which avoids complications with restore
(that may occur if /hdd3 is changed from fat to something else).
It occurs to me that the process could be made even easier if someone prepares a .ipk
containing a working Debian disk image.
The downside is that some of the Debian stuff is slow on the Z, since it was mostly written with
2-3ghz processors and gobs of memory in mind. A swap file is recommended.
(Some of the earlier descriptions for installing Debian required rebooting to switch between them,
using a vnc client and server, and reformatting hdd3 as ext2. None of this is necessary).