Available for the BlackBerry Pearl, Pearl Flip, Onyx, Tour, Storm, Bold and Curve, WikiPock will run on OS 4.3 or higher. You can grab a copy for $9.99 from everythingberry.com, but there is one other major consideration...
Squeezing the entire contents of Wikipedia onto a BlackBerry isn't easy. In fact there are two versions of WikiPock available - the Basic Edition (reviewed here) which does not include updates and the Plus Edition which offers updates for 12 months.
These updates carry any changes to Wikipedia that have been made in the intervening months. As explained earlier, WikiPock doesn't download data from Wikipedia (other than when updating) - instead the whole encyclopedia is installed on your BlackBerry.
To do this requires 4 GB of spare flash ram.
While inexpensive, it is a considerable requirement, and one that stops WikiPock from being a perfect app.