A rapidly changing area. Webmasters will have to stay on top of this one. No one can find it all and it changes constantly. Here are the best of breed of the search engines. Start with the tutorials.
Search engines are powerful, but most effective when the techniques are learned first.
Those with extensive telecommunication backgrounds will not need to spend much time here, but others are advised to spend some time reviewing these sites. Community Networks - Complete information on Community networks and what they have to offer. Computer networks, by Derek Hill - Complete course notes on computer networks from UMDS, radiology labs. The List - A List of ISP's by region. Excellent for finding ISP's in any specified area in the World.