gshray, congratulations on the new acquisition...
1) OpenZaurus has evolved into Angstrom now and it is not being maintained any longer (correct me if I'm wrong).
2) To install apps you need an internet connection to the zaurus, then you can use "ipkg" in the terminal. You might need to update the links for the feeds in "/etc/ipkg.conf" an alternative is the "Package Manager" under the "Settings" tab (but I don't recommend it).
3) You can also download the deb files to your pc and then transfer them to the zaurus on the SD or CF card. you can find them in the Feed Browser
This is my /etc/ipkg.conf
# Must have one or more source entries of the form:
# src <src-name> <source-url>
# and one or more destination entries of the form:
# dest <dest-name> <target-path>
# where <src-name> and <dest-names> are identifiers that
# should match [a-zA-Z0-9._-]+, <source-url> should be a
# URL that points to a directory containing a Familiar
# Packages file, and <target-path> should be a directory
# that exists on the target system.
# Proxy Support
#option http_proxy http://proxy.tld:3128
#option ftp_proxy http://proxy.tld:3128
#option proxy_username <username>
#option proxy_password <password>
# Offline mode (for use in constructing flash images offline)
#option offline_root target
lists_dir ext /var/lib/ipkg
src/gz upgrades http://www.openzaurus.org/download/18.104.22.168/feed/upgrades
src/gz machine-upgrades http://www.openzaurus.org/download/22.214.171.124/feed/upgrades/machine/c7x0
src/gz machine http://www.openzaurus.org/download/126.96.36.199/feed/machine/c7x0
src/gz base http://www.openzaurus.org/download/188.8.131.52/feed/base
src/gz opie http://www.openzaurus.org/download/184.108.40.206/feed/opie
dest root /
It seems to work okay, before you try installing anything using ipkg do from the command line
Then if you want to install anything (in this case qpdf2 which is a pdf viewer for OPIE),
ipkg install qpdf2
I hope this is helpful...