Before install make sure you have installed folowing libraries:
If you are missing something, yum it in.
ln -s libstdc++-libc6.2-2.so.3 libstdc++-libc6.1-1.so.2
Make sure you have Java 1.4.2 installed. I was not able to run Sonic Workbench under Java 1.5., due to Process Editor crash.
Currently using Java 1.4.2_14. Don't worry Eclipse has it's own compiler so can still produce 1.5 compatible classes (when needed).
3. Run it
If you got an XPCOM error, add following two lines to startworkbench.sh (or choose your own way of setting MOZILLA_FIVE_HOME variable).
# to make SWT browser support work
This was done on my home FC6 (Linux frodo 2.6.20-1.2948.fc6 #1 SMP Fri Apr 27 19:48:40 EDT 2007 i686 i686 i386 GNU/Linux).
It also worked on my laptop with Fedora 8 (Linux javadev-nb 18.104.22.168-85.fc8 #1 SMP Fri Dec 7 15:49:59 EST 2007 i686 athlon i386 GNU/Linux).