Have done it myself, it's really simple. All you need is a button and the 'XBMC.LastFM.Love' function, eg
Code:
<control type="button" id="9000">
<posx>-80</posx>
<posy>0</posy>
<description>lastfm love</description>
<width>40</width>
<height>40</height>
<texturenofocus>osd-love-nofocus.png</texturenofocus>
<texturefocus>osd-love-focus.png</texturefocus>
<onleft>907</onleft>
<onright>9001</onright>
<onup>901</onup>
<ondown>901</ondown>
<onclick>XBMC.LastFM.Love</onclick>
<visible>LastFM.CanLove</visible>
</control>But 'official' support would be better though..

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