Don't download more than once every 3 minutes.
Remove the licenses from the templates for now, until i find a way to include
them nicely.
Get rid of the last_download_date field. Do the calculations dynamically.
Add an Admin widget for ArticleVariants.
Add some rudimentary logging.
Upgrade the field size of  a slug to 255.

Return slug for the Source __unicode__ method.
Add a knob to show similar items.
Make a list of similar items for a NewsVariant.
Set a __unicode__ method for NewsVariant.
Get rid of superfluous logging statement.
Refactor a little bit.
Replace the name ArticleVariant with the saner name: ArticleVersion.