Here are links to a few other informative Queen concert-related websites, all of which I recommend highly because they have something unique to offer:
https://queenforum.net - the finest Queen discussion forum there is
http://www.queenconcerts.com - covers virtually all other ground related to Queen's concerts
http://www.queenonstage.com - information about silver and LP bootleg releases, new and old
http://qliverecordings.tripod.com - a lot of information here, including TV appearances, cancelled concerts, and more
http://www.webalice.it/pikkololuca - detailed information on existing concert videos
http://www.queenfcg.de - includes a link to the informative "Her Majesty's Secret Service" book by Andreas Voigts
Here are a few links that are beautiful examples of individuals and/or music trading communities who have collectively united to document the unofficial recordings of their favourite artists meticulously to ensure that only the best versions circulate:
Genesis - http://www.genesis-movement.org
Led Zeppelin - http://uuweb.led-zeppelin.us
Nirvana - http://www.livenirvana.com
Pink Floyd - http://www.pf-db.com
Rush - http://www.digitalrushexperience.com
Tool - http://www.collectiveunconscious.org
U2 - http://www.u2gigs.com
Frank Zappa - http://www.zappateers.com
Other great websites:
http://www.forgotten-yesterdays.com - a fantastic recollection of all things related to Yes concerts
http://www.thegardentapes.co.uk/ - a brilliant analysis of the officially released Led Zeppelin live albums
http://www.collectorsmusicreviews.com - an extensive database of bootleg reviews
http://www.nolifetilmetal.com - thousands of rock/metal CD reviews