I went to iheartradio.com and clicked on blackberry logo and it asked for my e-mail address to send me the download link.
I received the e-mail with a link, clicked on the link and it took me to the iheartradio website where it requested for an e-mail address with no download button or anything I can click on.
Usually use radiostation.forme. Its the only last.fm client I know for BB. Works pretty good and its free. Well gotta pay $3/month for last.fm in Canada.