This place is for the people who are serious about their tea. They have a wide selection of loose tea from around the world, as well as a section of tea gadgets and accoutrements. It's in a series of quaint shops in Pike Place Market that I like to hit when playing tour guide for friends from out of town. They have a bunch of specialty teas that can be a real treat, but also really expensive for your average cup of tea. For this reason I think it serves as a great stop for gift shopping (assuming you're buying for someone who likes tea).
http://www.perennialtearoom.com/
more