What's the point of the canvas in KDE 4?

I'm digging into KDE 4, and I can't quite figure out the rational of a canvas with "collections of widgets", rather than just using virtual desktops. Could you guys enlighten me? I can understand it's usefulness in demoing KDE 4 features in the vid, but in what "real life" situations are you guys using this capability instead of just using virtual desktops?

http://hanschen.org/2011/02/04/activities-a-change-in-workflow/ wrote:With activities you can associate a particular window with more than one activity. You should have everything you need for a certain task in an activity, which eliminates the need to switch back and forth between activities (unless you really want to switch task). In the example with the music player I would associate it with both my coding and my report writing activity.
Here is how I use activities right now, as a real-world example to get your ideas going:
Right now I keep 3 activities and have a couple extra keys on the keyboard mapped to switch between activities.  One is my general purpose one, with a notes widget, weather, a working folderview.  I also use virtual desktops in addition to the activities.  So I can stay on my general purpose activity and have a couple virtual desktops to work across with that layout.  It is very similar to how I did things before activities, and where I spend most of my time... using virtual desktops within that general purpose activity.   My second activity is research stuff.  This activity uses the Newspaper layout of the desktop, rather than the normal desktop layout.  I have the dictionary widget, a calculator, translator, and several other research/utility type of widgets in that layout.  So when i need to look up a word or look up something, I hit the key on the keyboard to switch to that activity and I have a dictionary right there, along with a bunch of other utilities.  I use the newspaper layout for that activity to keep all the utility widgets in a row, rather than scattered about.  I also keep a plainer background on that activity so it isn't distracting.   My third activity is for doing recordings (I write / record songs for fun).  This activity has a very clean desktop, with launchers for the applications I use (Jack, Ardour, Audacity, etc...), and a nice big folderview of the directory where i keep my recording projects.  This makes it easy to pull up recording stuff and have all the files and applications right there for me.

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