Today we've expanded the mobile site to include the forums. Additionally, we have added a mobile viewer for Completed Builds that lets you to browse, vote and comment. As with other areas, we have tried to retain as much of the desktop site experience as possible, while squeezing things down for a comfortable handheld browsing experience.
And as always, you can toggle between the desktop and mobile sites at any time using the link at the bottom of any page. Let me know if you run into any issues or have any suggestions.