One of the pains of windows software is portability ! Install the app, it makes changes to registry, uninstall it, leaves registry bloated. And if you wish to backup data, you'll need to manually figure it out.
Portable Apps is a collection of popular applications which carry data along with application. It has minimum installation and no need to backup (registry, Application data, My documents, etc). And it is FREE.
Check out the entire list of applications available at http://portableapps.com/
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