Even for people not interested in tea, it's worth taking a look at their site. They have one of the nicest, most user-friendly e-commerce designs I've ever come across. It's full of little things like making the tracking information for your orders available directly from the top navigation bar, and it's all presented in a visually pleasing way.
I started drinking tea after reading "A Hacker's Guide to Tea": http://news.ycombinator.com/item?id=1934051 a couple years ago. That article was written by the guy who ran the Chicago Tea Garden, but he closed a couple of months ago.
Honestly I just think TeaVana has better tea, even though I prefer Adagio's website, and the fact that they have decaf green teas.
edit: Just tried it, they still do.
EDIT:
For whatever it's worth, I just emailed them asking what the deal is here. Hopefully it's something they plan on fixing.
Their stuff is expensive, but it's good. And really how much is expensive tea per glass? 25 cents? Not enough that I care.
And they have all sorts of great mixes. I probably wouldn't order just straight tea there. But the tea quality at TeaVana is much higher than the coffee quality at Starbucks.