(shameless plug) not a tutorial per se, but for the overall concepts of 
places and activities (which I reiterate have not much to do with MVP), see:

   - http://tbroyer.posterous.com/gwt-21-places
   - http://tbroyer.posterous.com/gwt-21-places-part-ii
   - http://tbroyer.posterous.com/gwt-21-activities
   - http://tbroyer.posterous.com/gwt-21-activities-nesting-yagni
   
I never used any other "framework" or toolkit so I can't compare. I looked 
at GWTP and Mvp4g documentations though, and I didn't like the way they 
approach the problem (well, and they are "heavy" frameworks, and I hate 
frameworks; places do one thing, and they do it well, PlaceHistoryHandler 
then plugs them to the browser's history, and it does it well; activities 
are a lightweight, micro-framework built on top of places, and they do their 
job well; you can use places without activities, you can also easily 
"escape" and switch to something else, and/or mix activities with another 
pattern/toolkit; there are limitations in what activities do and allow 
out-of-the-box, but it's easy to add/modify/replace behavior if you want it, 
possibly localized to a single point in your app, and keep the 
out-of-the-box behavior else where; because it's more a toolkit than a 
framework)

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