Bookmarklets to give you a QR code for selected HTML or text. Copy each to a bookmark.

qr-my-html-selection.js

    javascript:
    var html = "";
    if (typeof window.getSelection != "undefined") {
        var sel = window.getSelection();
        if (sel.rangeCount) {
            var container = document.createElement("div");
            for (var i = 0, len = sel.rangeCount; i < len; ++i) {
                container.appendChild(sel.getRangeAt(i).cloneContents());
            }
            html = container.innerHTML;
        }
    } else if (typeof document.selection != "undefined") {
        if (document.selection.type == "Text") {
            html = document.selection.createRange().htmlText;
        }
    }
    window.open('http://chart.apis.google.com/chart?cht=qr&chs=300x300&chl=' + html);

qr-my-text-selection.js

    javascript:
    var selected = "";
    if (typeof window.getSelection != "undefined") {
        selected = window.getSelection();
    } else if (typeof document.selection != "undefined") {
        if (document.selection.type == "Text") {
            selected = document.selection;
        }
    }
    window.open('http://chart.apis.google.com/chart?cht=qr&chs=300x300&chl=' + selected);

Credit for the selection code: http://stackoverflow.com/questions/4652734/return-html-from-a-user-selection/4652824#4652824

But just noticed that it's also selecting HTML. Might not want that.

Added qr-my-text-selection.js for non-HTML selection.