vagalume's web page says it's in the extra's repo., but it's not listed on my N900 :-/
However, in March 2009 Last.fm announced some new restrictions in their radio streaming service (see here and here), which can be summarized as: * You need to pay to stream music from Last.fm * You cannot use Last.fm from a mobile phone
Unfortunately these Last.fm restrictions don't allow streaming music to mobile phones, so the N900 version of Vagalume comes without the Last.fm data. You can still use Libre.fm, though.