It looks like they are trying to make the dumps available on S3: http://meta.stackoverflow.com/questions/158050/regular-stack...

They also have odata endpoints so you should be able to get at the data (updated weekly) that way. It looks like there is a problem with it at the moment, though (I get 'server error'): http://data.stackexchange.com/stackoverflow/atom

Yes, but the last I could find is from 2011 http://blog.stackexchange.com/category/cc-wiki-dump/

August 2012 : http://www.clearbits.net/creators/146-stack-exchange-data-du...

They did monthly or bi-monthly data dumps. Not sure whether they still do. A few gibibytes of zipped XML would be a bit hard to ship, though :P

You could allow people to download a tag for offline use. Would be more data to store though.