The iBook is quickly becoming my development platform of choice.  I find its more intuitive to me than Windows (since I cut my teeth on Unix) and its easier to use than my Linux box (it runs standard open source tools with ease and the UI and management tools are superb).  I just finished getting up to speed on jBOSS and rewriting a credit card gateway simulation bean I give to my class to use the jBOSS xdoclet template.  The iBook was a great platform for this work.