Sounds as though you're connected as an ultrapeer. Even though nobody's downloading from you, you're handling connections from other computers so that other people can search & download

Check out stief's explanation of incoming & outgoing connections in the thread below
http://www.gnutellaforums.com/showth...ng+connections

There's an explanation of ultrapeers below
http://basis.gnufu.net/gnufu/index.p...s_really_short