On the built in Twitch.tv client:
http://www.twitch.tv/las0m
<object type="application/x-shockwave-flash" height="378" width="620" id="live_embed_player_flash" data="http://www.twitch.tv/widgets/live_embed_player.swf?channel=las0m" bgcolor="#000000"><param name="allowFullScreen" value="true" /><param name="allowScriptAccess" value="always" /><param name="allowNetworking" value="all" /><param name="movie" value="http://www.twitch.tv/widgets/live_embed_player.swf" /><param name="flashvars" value="hostname=www.twitch.tv&channel=las0m&auto_p lay=true&start_volume=25" /></object><a href="http://www.twitch.tv/las0m" class="trk" style="padding:2px 0px 4px; display:block; width:345px; font-weight:normal; font-size:10px; text-decoration:underline; text-align:center;">Watch live video from las0m on www.twitch.tv</a>