IBM provides several classes on System i (which is the current name for the product line initially introduced as the AS/400). One starting point would be <a href=”http://www-304.ibm.com/jct03001c/services/learning/ites.wss/zz/en?pageType=page&c=a0011023″>here</a>. There are also educational offerings available through other companies — google on ‘iSeries training’.
Depending on your location you may also find a local community college that offers System i education.
<pre>If you are in the UK, I had all my as400 / iseries training from </pre>