I don't know about ear training systems - I developed relative pitch over the years and with a bit of help from a musicians institute book on ear training which you can get from here. It's got loads of audio samples as well. I can hear different chord types, intervals etc, but I couldn't tell you what note it is I can hear.

I had some software a while back which was supposed to cover ear training, but all the audio was piano, and it didn't work well for me. I've no idea how long it would take you to develop perfect pitch - linking notes to colours etc... I've seen software promising results, but have always been dubious.