OlliPolli has updated his offline Wikipedia reader. "At the moment DSwiki can't do more than displaying mostly unformatted wiki markup of articles (but word and line breaks and a proportional font make it easily readable)". Check the included readme file for further instructions on how to install and use DSwiki.
Quote
I have released a new version of DSwiki. Version 0.1alpha2 is the first version that makes the Wikipedia completely accessible on the DS.
Changes and added features:
* The index can be searched, so every article can be accessed. Press X for an input form. * The shoulder buttons navigate through the complete history of visited pages. * A cache of 2MB size is saving all recently visited pages, what is quite faster than retrieving and unpacking it from disk every back and forth. * There should be no big memory leaks anymore, browsing can be (nearly) endless. * s are handled correctly. * There is no separate Unifont-version to display more glyphs, but a stable release will have one included.