What's the best known way to import masses of data into Craft?
Are there tools that support the migration of content/users from say XML, JSON etc.
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There is craftimport which is an 'unsupported' starting point for importing entries from an XML source.
There is also Import:
which can import from CSV sources.
Check out http://straightupcraft.com/craft-plugins for a list of current Craft plugins.
If you’re comfortable with PHP, Craft has some plugin APIs that make creating content relatively painless. For example, EntriesService::saveEntry().
It's not mentioned above, but in my experience the FeedMe plugin is by far the best way to import content.