Coming from San Francisco, I'm spoiled by our bounty of excellent local beers.  I stumbled upon Brew Dog while visiting Edinburgh for the first time during Fringe.  Brew Dog is proof-positive that there is hope for high-quality craft beer in the UK and beyond.  Loved the Hardcore IPA (Medicine for HopHeads).  Also really enjoyed a guest-brew of Drop Dead Imperial Stout.  Tasted several others, including the Punk IPA and a Hef (Vice Bier)  that would be fabulous on a hot day.  (Does it ever get hot in Edinburgh?)  If you love interesting well-made beer and a friendly environment, this is a must-visit place.  My only complaint...the bar stools are too short.  Oh yeah, and the WiFi is terrible.