My company is looking at an ERP system which will run on either an AS/400 or a Unix (client-server) platform. Are you aware of any studies comparing the long-term costs of the AS/400 versus Unix?
Following are some links that tout the positive benefits of the AS/400.IBM's AS/400 Consultant reports. Be sure to check the last link on the page "Server selection: Reversing the trend of rising IT costs".
AS/400 leads the league in Java performance
Riding the wireless wave with the AS/400
AS/400: Substance Over Style
Old Dog, New Tricks
IBM AS/400 proves its prowess