• BookMooch: book swapping
• Magnatune: music service

Other web sites I run:

• Piazzolla.org: tango music
• TubeClan: the best of Youtube

• BookMooch blog
• Magnatune blog

Social networking accounts:

• Dopplr: where in the world am I?
• Facebook
• Linked In

Other:

• Personal home page
• My Wikipedia bio