last.fm
How many of you (last.fm) users listen to music only on your own? Have music on when you have friends over? What I'd really like to see is the ability to scrobble tracks to multiple profiles, so that everyone would be able to get credit for what they listen to. This is quite important if you spend a lot of time with others, and/or listen to particular things at other peoples' places. However, last.fm thinks that this is too "niche" (read: users don't have social lives). We disagree. We've set up the We listen to music together group on last.fm - if we can get enough support and members, we might be able to get them thinking seriously about this feature. Please join our campaign!