I have got an inexpensive no-name 8 GB CompactFlash card. As Jynx wrote
at the Mastodon some time ago it should work with the Zaurus by
default. And yes, it works.
My SL-C3200 has the 6 GB HDD so have another 8 MB of space for data is
not a bad thing. These 8 GB might look like small value in these days
but all my music collection of music and e-books can fit easily into
such space.