Steam recently changed the default privacy settings for all users. This may impact tracking. Ensure your profile has the correct settings by following the guide on our forums.
meh, i used last.fm for awhile, but the iphone/touch app was so crappy, that i just switched to pandora, it's iphone app it's 100x better than last fm's imo.
edit: just realized this is about 5 months old, my bad