We consider Wikipedia as a testament and example of the internet's greatest strength, a vast well of knowledge for nearly every topic under the sun. Who hasn't used it at least once as reference or resource? However, when accessed through native phone (and tablet) browsers, the Wikipedia is less than ideal, as it's not optimized for smaller mobile screens. Fortunately, there are a few mobile solutions which help streamline and add to the Wikipedia experience...
All of Wiki - Offline
A library's worth of knowledge lies within Wikipedia, and now you can access it even while offline. A download package of 4GB (for all articles in English, 2GB additional per language) is all it takes to travel with all the information that Wikipedia has to offer. All of Wikipedia's data and pictures is efficiently bundled into that package and regular monthly expansions can be downloaded to keep the database up to date. Not everyone has a data connection to their iPads or Touch's and this is a worthy alternative to the constant data charges. $9
WikiDroid stands out with several features such as voice search, full screen mode and article saving. The interface is well designed, with plenty of customizing options for reading. For those who are rigorously backtracking their research to the same pages have the option to save posts straight to Android devices for offline referencing. One function I personally am crazy about is the bookmarks and home screen shortcuts. Having favourite or relative material on hand is always helpful and has the secondary advantage of acting as a reminder. Free - Ad-Free: $2
Last but not least , Wikipedia Reader is the WP7 app for offline Wikipedia browsing. Articles can be saved for later and even pinned to the home screen for easy to remember access. The UI is distinctive (and bright for those who love white) and appeals more to the lighthearted reader than the researcher, designed to be enjoyed by those who like to jump from topic to topic (although it does suffice for those looking for references and information as well). Free - Ad-Free - $2