Or have it sign you into the BLF site, then you pick a topic, and when the little "NEW" icon appears then send the player a pop-up message or w/e. This does however involve pinging BLF over and over, preferably ever 5-10 minutes as to not cause any issues, in order to parse through the raw, simple, html on the site. You can even go one step further and use ;wap2 if you wanted to make it easier. Have a prime example:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Suggestions & Requests</title>
<link rel="stylesheet" href="http://forum.blockland.us/Themes/default/wireless.css" type="text/css" />
</head>
<body>
<p class="catbg">Suggestions & Requests</p>
<p class="titlebg">Topics</p>
<p class="windowbg">(1/2534) <a href="http://forum.blockland.us/index.php?board=28.9;wap2">></a> <a href="http://forum.blockland.us/index.php?board=28.22797;wap2">>></a> </p>
<p class="windowbg">[1] <a href="http://forum.blockland.us/index.php?topic=277037.0;wap2" accesskey="1">Money Add-on (details in post)</a> [<a href="http://forum.blockland.us/index.php?topic=277037.msg0;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[2] <a href="http://forum.blockland.us/index.php?topic=277021.0;wap2" accesskey="2">Taking Suggestions</a> [<a href="http://forum.blockland.us/index.php?topic=277021.msg0;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[3] <a href="http://forum.blockland.us/index.php?topic=277056.0;wap2" accesskey="3">Automatically name bricks</a> [<a href="http://forum.blockland.us/index.php?topic=277056.msg0;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[4] <a href="http://forum.blockland.us/index.php?topic=277012.0;wap2" accesskey="4">{FORUM SUGGESTION}</a></p>
<p class="windowbg">[5] <a href="http://forum.blockland.us/index.php?topic=277048.0;wap2" accesskey="5">Remake Bot_PrefersRanged event</a> [<a href="http://forum.blockland.us/index.php?topic=277048.msg0;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[6] <a href="http://forum.blockland.us/index.php?topic=277039.0;wap2" accesskey="6">Restricted brick tab building</a> [<a href="http://forum.blockland.us/index.php?topic=277039.msg0;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[7] <a href="http://forum.blockland.us/index.php?topic=275296.0;wap2" accesskey="7">Raise the maximum draw distance limit</a> [<a href="http://forum.blockland.us/index.php?topic=275296.msg8249986;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[8] <a href="http://forum.blockland.us/index.php?topic=274670.0;wap2" accesskey="8">Bring Back Maps!</a> [<a href="http://forum.blockland.us/index.php?topic=274670.msg8154586;wap2#new" class="new">New</a>]</p>
<p class="windowbg">[9] <a href="http://forum.blockland.us/index.php?topic=277032.0;wap2" accesskey="9">Falling Bricks and Brick Health</a> [<a href="http://forum.blockland.us/index.php?topic=277032.msg0;wap2#new" class="new">New</a>]</p>
<p class="titlebg">Navigation</p>
<p class="windowbg">[0] <a href="http://forum.blockland.us/index.php?;wap2" accesskey="0">Up one level</a></p>
<p class="windowbg">[#] <a href="http://forum.blockland.us/index.php?board=28.9;wap2" accesskey="#">Next page</a></p>
<p class="windowbg"><a href="http://forum.blockland.us/index.php?action=post;board=28.0;wap2">Start new topic</a></p>
</body>
</html>
26 lines of code, each topic on this page states the "NEW" class at the end except for this topic.
<p class="windowbg">[4] <a href="http://forum.blockland.us/index.php?topic=277012.0;wap2" accesskey="4">{FORUM SUGGESTION}</a></p>
Idk about you but coding a client add-on that can ping this site and look for the new class at the end of this specific topic will take very little time. I'm horrible with making client GUIs so I will not make this.