flavored tea is usually not good.
earl grey is a kind of exception, but i personally think it's still kind of fru-fru.
if you go to harvard square, cardullo's and tealuxe both have excellent teas. at tealuxe, they might even teach you a bit.
http://en.wikipedia.org/wiki/Tea
as usual, great place to start. as Norton suggested, loose is almost always better.
also imo, cream and sugar mask the flavor of high quality tea. there are a few exceptions, but i find that they are rare. don't get me wrong, i'll sweeten up some tea sometimes (e.g., southern Lipton "sweet tea"), but it's not good stuff.
some easy teas to start with:
oolong (semi-oxidized)
gunpowder green (green)
darjeeling (black)
a little more complex (or acquired taste):
Jasmine
Lapsang Souchang
Assam
be careful with the blends (like English Breakfast, Irish Breakfast, etc.). they
can be good, but often aren't (at least in the US).
Another good web page:
http://pages.ripco.net/~c4ha2na9/tea/faq.html
final note... don't steep the tea too long. it can make a good tea WAY too bitter.