Mittel der JQuery Extension "jQCloud" und ein wenig TypoScript konnte ich erfolgreich eine TagCloud basierend auf Tags der "News" Extension implementieren. In den jeweiligen Seiten wird folgender Code zum rendern der TagCloud eingefügt:

<div id="wordcloud" style="min-height: 100px;"></div>

Folgendes Typoscript erzeugt das Javascript-Array:

page.jsInline {
    2010 = COA
    2010 {
        stdWrap.outerWrap (
            var word_list = new Array( | );
            $(document).ready(function() {
                $("#wordcloud").jQCloud(word_list, {encodeURI: false});
            });
        )
        2010 = CONTENT
        2010 {
            table = tx_news_domain_model_tag
            select {
                pidInList = <PID der TAGS>
                join = tx_news_domain_model_news_tag_mm ON (tx_news_domain_model_news_tag_mm.uid_foreign=tx_news_domain_model_tag.uid)
                groupBy = tx_news_domain_model_tag.uid
            }
            renderObj = COA
            renderObj {
                10 = TEXT
                10.field = title
                10.noTrimWrap = |text: "|"|
                
                20 = TEXT
                20.numRows.table = tx_news_domain_model_tag
                20.numRows.select.pidInList = <PID der TAGS>
 20.numRows.select.uidInList.field = uid
                20.numRows.select.join = tx_news_domain_model_news_tag_mm ON (tx_news_domain_model_news_tag_mm.uid_foreign=tx_news_domain_model_tag.uid)
                20.noTrimWrap = |, weight: ||
                
                30 = TEXT
                30.typolink.parameter = <PID Listview>
                30.typolink.returnLast = url
                30.typolink.additionalParams.dataWrap = &tx_news_pi1[overwriteDemand][tags]={field:uid}
                30.typolink.additionalParams.rawUrlEncode = 1
                30.typolink.useCacheHash = 1
                30.noTrimWrap = |, link: "|"|
                wrap = { | }###SPLITTER###
            }
            stdWrap.split {
                token = ###SPLITTER###
                cObjNum = 1 |*| 1 |*| 2||3
                1 {
                    current = 1
                    wrap = |,
                }
                2 {
                    current = 1
                    wrap = |
                }
            }
        }
    }
}