...and some interesting sites
http://www.discogs.com/ the bible for LP collectors
http://www.popsike.com/ you want to know how much rare vinyl has been awarded on ebay? Excellent site for vinyl fans!
http://classicrecords.co.uk/ a great classic vinyl music site with an interesting interesting "collector guide"
http://www.thamesweb.co.uk/market/records/sxl.htm the almost complete list of "wide band" Decca
http://wegavision.pytalhost.com/ many many online browsable catalogs