WikiTaxi offers you an offline snapshot of the Wikipedia. The full English dump is only 3.5GB. (An abridged version is a svelte 25MB.)
Did you ever want to take Wikipedia with you while you are offline? Call on WikiTaxi: It is a portable application that delivers the Wikipedia of your choice to wherever you go.
WikiTaxi enables you to read, search, and browse Wikipedia offline. No Internet connection is needed, all pages are stored in a WikiTaxi database. Because Wikipedia is constantly growing, WikiTaxi uses compression to make sure that the database stays reasonably small.
WikiTaxi is up to date. It works with the original Wikipedia database dumps, which are updated regularly every few weeks or so. If you feel that your offline Wikipedia is getting to old, you can go online to download a more recent version or just copy it from a friend.
Not only is this just simply kewl, but I imagine scholars looking for a way to measure changes in the wikipedia will love this.