Music based social network whatnot Grooveshark have launched a new service, Grooveshark Lite, which aims to pull users from both Last.fm and Pandora, by offering improvements on their features. The site plays recommendations based on an initial song selection and allows users to pause, skip, replay tracks played, something not offered by Last.fm or Pandora. Though as I understand it that functionality isn't offered by the others for licensing reasons, so whether that means Grooveshark have negotiated a better deal with the labels I'm not sure.
Check it out here