7. Java
Java is downloadable and redistributable from Sun, but only for
personal and not-for-profit use. Sun's Java license is non-open-source,
so Fedora and most other Linux distributions won't carry it.
Fedora Core 5 includes an open-source Java implementation for
programmers called gcj. You only need to take special action if you want
to enable applets in your browser. The Unofficial Fedora FAQ has detailed instructions on how
to do this.
You can test your Java plugin at Sun's Applets page. Note that
some of these applets (Escher and Starfield, when I checked) appear to be
broken. BouncingHeads makes a good test.
You might also want to copy the RPMS you built out of
/usr/src/redhat/RPMS/ so you'll have then handy for
reinstalls.