The css for our.umbraco.org contains a lot of fixed widths which means its doesnt scale properly on tablet or mobile with smaller screens.

I have made the following css enchancements for devices with screens less than 990px wide. It doesnt cover the entire site but focuses mainly on the forum and wiki. It could be optimized further for mobiles though. Use if you want..

@media all and (max-width: 990px) {
    .wrapper, #contentArea {
        width: 90%;
        margin: 0 auto;
    }

    body {
        background: none;
    }

    .forumList .latestComment {
        width: auto !important;
    }
    #forum table.forumList td.replies, #forum table.forumList td.votes {
        font-size: 12px;
    }
    #forum ul.commentsList li.post .comment {
        width: auto;
        margin-left: 80px;
        float: none;
    }

    #forum #commentBody_parent, #forum #topicBody_parent {
        width: 99%;
    }

    /* projects*/
    #projectDescription {
        width: auto !important;
    }
    #forum {
        width: auto !important;
    }

    /* wiki */
    .projectGroups li div {
        width: auto;
    }
    .projectGroups li {
        width: 48%;
    }
    #wiki #options {
        width: auto;
    }

    /* People */
    .spotlight {
        width: 45% !important;
    }
}