The negative about sharing on more than one network at one time of course is the sacrifice in bandwidth & affect it has on other networks. There's at least one network where you can only downld as fast as you upload. Then if people are uplding from you one one or more networks, what happens to people on the other networks you're connected to? They suffer!!! They either can't connect or get incredibly slow downlds from you. That's why multi-network programs tend to not work so well whilst they allow multi-network connection at one time. On Gnutella, I'm sure most people would be aware how slow & unreliable Shareaza (Raza) can be. This also applies to the others such as morpheus & Gnucleus, etc. This is not an opinion, it is fact. If these programs only connected to one network at a time, then problem solved. (else dedicating a minimum of 5 KB/s per upload slot per network connected to at the time might work if there's the bandwidth to allow this.)