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Good idea. There's a few minor niggles, though:

1. Don't use unsafeWindow, this will break in Chrome and will not even work in Firefox+Greasemonkey if the effective @grant changes.

2. Avoid leading * wildcards in @includes, if you can help it. This is a big performance hit. @match limits the wildcard scope and performs much better and reports the sites/security correctly on Chrome. This gets all current SE sites:

    // @match       http://*.askubuntu.com/questions/*
    // @match       http://*.onstartups.com/questions/*
    // @match       http://*.serverfault.com/questions/*
    // @match       http://*.stackapps.com/questions/*
    // @match       http://*.stackexchange.com/questions/*
    // @match       http://*.stackoverflow.com/questions/*
    // @match       http://*.superuser.com/questions/*
   

3. The regex match needs to be more robust, to account for all legal characters in the URL, and for anchors.

4. Use injection so that the script will work on most userscript-capable browsers (Chrome, Firefox, Opera, Safari, etc.).

5. Mathoverflow.net is not an SE site! Use math.stackexchange.com for that. mathoverflow.net also does not appear to support the timeline view/page.

Here's a variant of the script I've been using (It works on Chrome and Firefox, and should work on most other userscript-capable browsers):

Easy install URL at GitHub for Greasemonkey, Tampermonkey, Scriptish, etc.

// ==UserScript==
// @name        Add Timeline Button to Stack Exchange questions
// @description Adds a "View Timeline" Button to Stack Exchange sites
// @namespace   StackExchange
// @match       http://*.askubuntu.com/questions/*
// @match       http://*.onstartups.com/questions/*
// @match       http://*.serverfault.com/questions/*
// @match       http://*.stackapps.com/questions/*
// @match       http://*.stackexchange.com/questions/*
// @match       http://*.stackoverflow.com/questions/*
// @match       http://*.superuser.com/questions/*
// ==/UserScript==

function addTimelineButton ($) {
    var buttonText      = "View Timeline";
    var timelineLink    = "#";
    var postNum         = 0;

    var postMatch   = location.pathname.match (/questions\/(\d+)\D/i);
    if (postMatch  &&  postMatch.length > 1) {
        postNum         = postMatch[1];
        timelineLink    = location.protocol + "//"
                        + location.host
                        + "/posts/"
                        + postNum + "/timeline"
                        ;
    }
    else {
        buttonText  = "Path error 1";
    }

    var targetNode  = $(".favoritecount");
    if (targetNode.length) {
        targetNode.after ('<a href="' + timelineLink + '">' + buttonText + '</a>');
    }
    else if (
        postNum
        &&  $("#content div.subheader > h1:contains('Page Not Found')").length == 0
    ) {
        alert ("From Timeline script:  Unexpected Page layout.");
    }
}

withPages_jQuery (addTimelineButton);

function withPages_jQuery (NAMED_FunctionToRun) {
    //--- Use named functions for clarity and debugging...
    var funcText        = NAMED_FunctionToRun.toString ();
    var funcName        = funcText.replace (/^function\s+(\w+)\s*\((.|\n|\r)+$/, "$1");
    var script          = document.createElement ("script");
    script.textContent  = funcText + "\n\n";
    script.textContent += 'jQuery(document).ready( function () {' + funcName + '(jQuery);} );';
    document.body.appendChild (script);
};