- File Transfer: the N900 is Full-UMS. Using software is not required (exept a file manager) and any software that manages a audio/video library can transfer data to N900. (Rhythmbox, Banshee, Amarok, etc ...)
- For a "Market Place, we have a "Application Manager" to download software. For Music download, I creat a software to download music on Jamendo (to start) for the school where I finished my last year of study. It should be out in November. After, I may add others catalogs (Magnatune, Dogmazik, etc ...).
- For social network share, we can use XMPP instant messaging protocol. For exemple: Send tag info of music that you listen, extend a DLNA network to your contact with the "pipe" in Telepathy Framework. There are plenty of development opportunities around the XMPP protocol: Look at this list of 161 extensions.
- We have a "Album art" in Maemo Media Player in Maemo 5. Look here