The 1369 Coffeehouse in Central Square, Cambridge is well-regarded. There’s also a Peet’s store in/near Harvard Square—I’ve never been there, but Peet’s coffee is quite good.

As far as Boston proper, I don’t know – I tend to stay on this side of the river.

excellent, thanks!

i have actually really enjoyed the coffee at the black seed cafe, formerly bagels plus, right near the park st. T stop at the intersection of tremont st. and park st. they’re nice folks, too.

Dunkin Donuts is always a hit. :)

I’d add to this: Flat Black, which has locations in Dorchester Lower Mills, Ashmont, and the Financial District. Roasted locally in Dorchester, and damn good.