RailroadRadio.net Dozens of live audio streams broadcasting railroad radio, from the US and Canada.

JEM Offering the JEM "Clean Cab" style railroad radio.

3D Technologies Offering "ScanControl"... A comprehensive software program that can control many models of Uniden radio scanners.

Black Cat Systems is one of the very few (if not only) companies to offer radio related software for Macintosh users. One of the numerous Mac radio applications they offer is MultiMode, which can decode ACARS, and numerous other modes on the Mac. If you're a fellow red-headed stepchild of the computing world (a Mac user), than this is the site to check out.

Radio Reference By far, the largest scanner and radio communications related site on the web.

Intercoms Online Offering the new MURS band based intercoms.

AirNav Systems Offering the excellent 'RadarBox' ADS-B receiver and software, for virtual radar aircraft tracking.

Scanner Laws A very good site indicating which states have laws against scanner use.

NTIA - US Frequency Allocation Chart This is a place where you can download a cool PDF frequency allocation chart that shows where all the bands are in the frequency spectrum.

The National Lightning Safety Institute This site should really be viewed by anyone installing an outdoor antenna. Lightning strike is a real and serious threat, and efforts should be made to make your outdoor antenna as safe as possible.

Uniden Online Makers of the Bearcat scanner line of radios.

TRAIN IDENTIFICATION

Motive Power Rosters Probably the best all-in-one site for locomotive rosters. It covers all the big roads, and most of the short lines. Heard a loco number on the radio you want to check out? This is probably the place to do it.

Altamont Press Time Tables This in my opinion, is one of the best publications for railroad information. Unfortunately, they only publish timetables for the western states for now. But they do have downloadable files that list train symbols, rosters, and other info for BNSF, UP and Amtrak.

RAIL PHOTO & FAN SITES

AlabamaRailfan.com A very nice site that has tons of info for what's happening in the Alabama area.

RTP Railfan A site based on railfanning around the North Carolina area. The site also has a radio stream for the area.

George Elwood's Site George has amassed photos for just about every railroad you can think of.

VARIOUS RAIL SITES

The Yahoo! Groups RailScan E-mail List This is an e-mail list where members discuss various railroad radio topics.

The Carolina Railfan Site Dedicated to the railroad activity in North and South Carolina.

New York City Subway Resources Maybe you monitor the New York subway system's radio. It is a train after all. Here's a big site with all kinds of NY Subway info.

Southeast Virginia Railfanning Lots of info and photos from the area, plus frequencies for the Tidewater area.

AIRCRAFT RELATED

PinkFroot.com - Offers unique iPad and iPhone apps that tie into their PlaneFinder.net ADS-B network, and also their Ship Finder Marine AIS network. A number of receivers in the PlaneFinder and ShipFinder network, utilize DPD Productions ADS-B and Marine AIS antennas.

Airliners.net Huge public photo archive of every type of aircraft there is.