I was recommended from IBM to migrate my WAS 5.1.1 to version 6.1 - This is requiring a great deal of work not only in upgrading the OS (we use AIX on our servers) but also we needed to change our development platform from WSAD 5.1.2 to Rational 7.0 (your results may vary, see dealer for details).
Good luck, this process has taken me since November when I started until now - we are planning to do the migration this month. Wish me luck!
Einstein47
(For best results: hand wash in cold, tumble dry low. For not so good results: drag through puddles, pound on rocks, air dry on tree branch.)