How much caffeine is in a starbucks tall cup of decaf?

I have 3 questions:
?	How much caffeine is in a starbucks tall cup of decaf? How many milligrams
?	How about in a tall ice coffee?
?	Do these vary from starbucks store to starbucks store, or form day to day?

I hear that Robusta beans has twice the caffeine of Arabica beans. 
Does Starbucks switch which one they use in their standard tall ice
coffee of a given day?.

thanx in advnce

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Clarification of Question by sherpaj-ga on 30 Aug 2005 23:14 PDT

also, how much in a can of starbucks doubleshot?

Coffee, grande (16 oz.), Starbucks 550 mg 
Coffee, tall (12 oz.), Starbucks 375 
Coffee, short (8 oz.), Starbucks 250 
NoDoz, Maximum Strength(1), or Vivarin(1) 200 
7-Eleven Big Gulp Cola (64 oz.) 190 
Coffee non-gourmet (8 oz.) 135* 
Excedrin (2) 130 
Maxwell House(8 oz.) 110 
Caffe Americano, grande (16 oz.), Starbucks 105 
No Doz, Reg Strength(1) 100 
Coffee, instant (8 oz.) 95* 
Caffe Americano, tall(12 oz.), Starbucks 70 
Caffe Latte/Cappuccino, grande 16oz Starbucks 70 
Espresso, double (2oz), Starbucks 70 
Water, caffeinated (Edge2O) (8oz) 70 
Anacin(2) 65 
Cola(20 oz) 60 
Mountain Dew(12 oz) 55 
Cola(16oz) 50* 
Tea, leaf or bag (8 oz) 50 
Caffe Americano, short (8 oz) Starbucks 35 
Caffe Latte, short (8oz)or tall (12 oz) Starbucks 35 
Caffe Mocha, short(8oz) or tall (12 oz) Starbucks 35 
Cappuccino, short(8 oz) or tall (12 oz)Starbucks 35 
Cola (12 oz) 35* 
Espresso (1 oz), Starbucks 35 
Tea, green or instant (8 oz) 30* 
Chocolate, dark, bittersweet or semi-sweet (1oz) 20 
Coffee, decaf, grande (16 oz), Starbucks 15 
Tea, bottled(12oz) or from instant mix (8oz) 15* 
Coffee, decaf, short(8oz) or tall(12oz), Starbucks 10 
Chocolate, milk (1oz) 5* 
Coffee, decaf, non-gourmet(8oz) 5* 
Cocoa or hot chocolate(8oz) 5* 
Espresso, decaf(1oz), Starbucks 5 
Tea, decaf(8 oz) 5*

corwin_02-ga, pls post this as the answer

Corwin's excellent comment cannot be posted as an answer as s/he is
not an Answers Researcher. Their names appear in blue.

This is a freebie for you , i am not an official researcher so you got
this out of the goodness of my heart (actually i looked it up because
i was curious too)