Here are the websites, and lists of some reliable traders I have dealt with. I have done trades, or had extensive dealings with each one, and they are all excellent traders. The primary bands of interest of each trader will appear after the hyperlink. Also a very partial list, one day I'll get everyone on here.

Traders
Bootleg Dreams (Dream Theater)
By Fans For Fans (Dream Theater and Related, Joe Satriani)
Cecordell's Trading Site (Dream Theater, Rush)
Digital Man Productions *Recommended Producer/Engineer* (Rush)
Explosivo's Trading Site (Judas Priest, Dream Theater, Heavy Metal)
Gebs's Trading Site *Recommended Producer/Engineer* (Rush, Iron Maiden)
HalenRush's Trading Page (Dream Theater, Rush)
Farve4's Trading Site (Dream Theater, Black Sabbath)
Fatal's Trading Site (Dream Theater and Related)

Flemming's Trading Site (Dream Theater)
Marooned (Pink Floyd)
Prog Snob's Trading Site *Under Construction* (Dream Theater)
Rocktrades Trading Site (Royal Hunt, Metal)
SimpleManProductions/CabinMusic *Recommended Producer/Engineer* (Rush)
Simon_LTD's Trading Site (Dream Theater and Related)
Tammeh's Trading Site (Rush, Dream Theater and Related, and Pink Floyd)
The Necromancer (Rush) (Retired, reference only)
The Ytse Collection (Dream Theater and Related, Joe Satriani)

This is a listing of all the sites, places, and people who have helped me collect the information on this site. 

Guides and Lists

The Digital Rush Experience (Rush) - You can find information here on every single Rush bootleg, and you can also download all artwork ever put out for Rush shows.

For Fans By Fans (Dream Theater) - ForFansByFans has close to all known artwork for DT shows, as well as info.

Borlag's List (Dream Theater) - Contains every DT audio show, and will in the future contain every DT video.
Ead666's Page (Iron Maiden) - Quite definitive collection of Maiden

Queensrÿche Guide / Art of Live (Queensryche) - Has known Queensrÿche tour dates, set lists, and lets you know if there is an audio or video bootleg of the show in existence. Also has a large amount of Queensryche art available.

Tommi's Porcupine Tree Site - Offers complete recording history for Porcupine Tree and Blackfield.

Marillion Bootlegs and Artwork Archive - Offers somewhat complete Marillion recording history and lots of artwork.

B&P/2:1 Guide - Helps beginning traders understand what they will need and how to execute a B&P trade.  For 2:1 just know that you will send twice as many discs that you plan to receive.

DC++ FAQ - Answers questions concerning DC++

All downloads found here are freeware, shareware, or are otherwise traded freely.  If you download straight from this site and like the products you use please check out the links to the products homepage.

Software

BCDC++ - For connecting to hubs.
Website
Download - If you don't install this over DC++ you will need to create your own desktop icon. Version 0.698a.

uTorrent - For use with torrent files/sites
Website
Download - Version 1.4.

Winamp - For playing FLAC/SHN/APE on your PC.
Website
Download - Includes Winamp (Version 5.13 full), and plug-ins for SHN, FLAC, and APE.

Trader's Little Helper - For running MD5 files, finding and fixing SBE's, encoding, and decoding.
Website
Download - Version 2.3.1

Ripper and Analyzer - For going from CD > WAV/FLAC and running frequency analysis.
Website - Many traders preferred burning program/converter/analyzer.

Winrar - For use with .rar and .zip files.

Website
Download

Forums/Trading and Torrenting Sites
The Alien Shore Forum - Rush trading forum.
Digital Rush Experience Forum - Rush trading forum.
Progressive Rock Remaster Project - Go into the trader's section to have access to torrents and forum.
Dimeadozen - Torrent site for lossless shows.  Especially good for video.
Jamtothis - Another good torrent site.
Bootcity - Another good torrent site.
The Traders Den - Yet another good torrent site.

Lossless DC++ Hub Registration Sites
Rush hub registration page - For getting on the lossless Rush DC++ hub.
Echoes Lossless Hub Registration (Pink Floyd) - Follow instructions on main page.