Daymia on MudCentral has written a very nice post illustrating all the aspects of the current classes. If nothing else, it's an interesting read, especially the excel graphs for spells:
http://www.metrobbs.com/cgi-bin/yabb/YaBB.cgi?board=mudideas;action=display;num=1074598829
Guide to Writing MajorMUD Classes [Link]
Re: Guide to Writing MajorMUD Classes [Link]
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Re: Guide to Writing MajorMUD Classes [Link]
[[nevermind]]
Re: Guide to Writing MajorMUD Classes [Link]
And the above post shows that Erek can be taught to repeat what it sees, thus shattering the myth that youth is unteachable. :P