Starbucks and I are on the outs right now because they just discontinued the decaf frappuccinos.
When I'm not pregnant or nursing, my favorite in the winter is a skinny half-caf hazelnut latte with 2 extra pumps of hazelnut. (Skinny means no whip, skim milk, and sugar free syrup. I was so glad when they added "skinny" to the menu so that I could order a drink in under 5 minutes.) In the summer I like the mocha frappuccino lights. When I'm pregnant or nursing I don't do sugar-free or caffeinated, so the drinks I order are much higher in calories and I go a lot less.
Oh, and by us none of the Starbucks have ever had free wi-fi and having a Starbucks card gets you free flavor shots, not free internet access. Luckily Caribou and Saxby's both have yummy coffee with lots of decaf options and free wi-fi.