It really is the most incredible resource ever. It's so useful to find out about exclusive regional releases, pressing variations and exclusive tracks on compilations, etc. I've discovered many new tracks/releases by my favourite bands that I never knew appeared on compilations. Recently also I discovered a Radiohead b-side that appeared exclusively on vinyl on a label compilation, which I ended up ordering. There are so many different examples of how useful a resource Discogs is. I log on pretty much daily.