Last.fm is currently experiencing some issues due to which the online suggestions and related music features would not be functional. Sorry for the incovenience. Will keep you updated when the service is back.
[Edit] Some Last.fm apis seem to be working intermittently, still very slow.
[Edit] All Last.fm apis seem to be down. Not working at all.
[Edit] Most of the Last.fm web services are still down. Charts sometimes works.