I don't get it. Why does everyone regard this thing as "either / or"?
I love Notes & Domino, and they're my "bread and butter" in terms of work. That said, whilst I agree that Websphere is an expensive option, and certainly not the obvious choice for smaller organisations, it still behoves any good developer to get into this stuff (OK, maybe not WS, but J2EE in general), surely?
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http://www.benpoole.com