If I have a SLES 10 SP1 machine that is ONLY running User App 3.5.1 (no
provisioning), and i need/want to change it's IP address, can I simply
go into the network settings and change it there?

Or does any of the jboss/tomcat/etc "care" what IP it had

We front-end the user app with iChain, so people use a DNS entry to hit
iChain which then goes to the machine (obviously I'd have to change the
iChain setup to point to the new IP)