hi
Test 488 - WebSphere Single Server Edition 4.0
Test 489 - WebSphere Advanced Edition 4.0 -Administrative
488 is more developers point of view... for this you must know
jsp,
servlets,
ejb on visual age - websphere test environment and using tools assembly, deployejb in websphere 4.0
and configuring websphere 4.0 server using adminconsole..
489 is more on security... maintanance of server ... trouble shooting...its mostly administor side...
choose the test depending upon role you have to lead in your company...
i took 488 and passed it.
mahesh