You can now read The Wire on the iPhone and iPad via The Wire app. Find it by searching the App Store for The Wire, or by clicking here. The app features page flow for browsing, full search, double-page view (iPad only) and can be synced to an iPad, iPhone and iPod touch for offline reading.
You can try the App for free. (Full access to every issue since August 2006 is available at £3.49 for 30 days)