From https://en.wikipedia.org/wiki/Wikipedia:Database_download#English-language_Wikipedia https://en.wikipedia.org/wiki/Wikipedia:Database_download#En... pages

From https://en.wikipedia.org/wiki/Wikipedia:Database_download#English-language_Wikipedia https://en.wikipedia.org/wiki/Wikipedia:Database_download#En... pages-articles.xml.bz2 – Current revisions only, no talk or user pages. (This is probably the one you want. The size of the 4 April 2013 dump is approximately 9.06 GB compressed, 42 GB uncompressed) bzip can be decompressed in chunks, can't it? I wonder if there's an app to read a compressed wikipedia xml archive on an ios or android tablet. Even better would be if it fetches missing resources (like embedded images) from the real wikipedia if there's internet access.