From the rec.radio.scanner FAQ, written by Bob Parnass, AJ9S:
Every day and night, scanner hobbyists are entertained by what they overhear on their radios. Police cars, fire engines, ambulances, airplanes, armored cars, trains, taxis, and buses are all equipped with radios and you can listen to them. You can monitor the local sheriff and fire departments to hear about events "as they happen," before the news reporters hear about them. Hostage dramas, bank robberies, car crashes, chemical spills, neighbor and domestic disputes, tornado sightings are all fair game. In a single afternoon, you can hear a high speed police chase, Drug Enforcement agents on a sting operation, and undercover FBI agents as they stakeout a suspect.
All sites submitted to the Recreation: Amateur Radio: Scanners category will be reviewed for content. Only sites with content of interest to entire scanning community will be placed in the main category.
Frequency guides for regions will be placed (and should be submitted to) the Regional category.
Businesses specializing in scanners should be submitted to the Vendors category.
It would be appreciated if the site submission is accompanied by clear, grammatically correct, and hype free descriptions. Editors must conform to the ODP Guidelines, so submissions that already conform to those Guidelines will make editing easier.
Frequency guides and related information for specific geographic areas.
Sites with content of interest to entire scanning community may be placed in the parent category, Recreation/Radio/Scanning/
Frequency guides for regions will be placed in (and should be submitted to) the Regional category.