I've often wondered what the caffeine content was of some products, so when I found this list I decided to post it.
CAFFEINE CONTENT: coffee, tea, soda and more
By Mayo Clinic staff
Do you know the caffeine content of your favorite beverages? And did you know that some sweets and even over-the-counter medications have caffeine? You may want to take a closer look at just how much caffeine you get in a typical day, especially if you're bothered by headaches, restlessness or anxiety. If your caffeine habit totals more than 500 to 600 milligrams a day, you may want to consider cutting back.
One note about the numbers: Use them as a guide. 
The actual caffeine content of the same coffee drink can vary from day to day — even at the same coffee shop — because of factors such as roasting and grinding, as well as brewing time. 
Type of coffee:                                        Caffeine (milligrams)
Dunkin' Donuts, brewed, 16 oz (480 mL)         143-206
Generic brewed, 8 oz (240 mL)                     95-200
Generic brewed, decaffeinated, 8 oz (240 mL)   2-12
Generic instant, 8 oz (240 mL)                      27-173
Generic instant, decaffeinated, 8 oz (240 mL)  2-12
Starbucks Espresso, 1 oz (30 mL)                  58-75
Starbucks Vanilla Latte, 16 oz (480 mL)           150
The caffeine content of tea also is affected by how long it's brewed.
Type of tea:                                            Caffeine (milligrams)
Brewed tea    
Black tea, 8 oz (240 mL)                              40-120
Black tea, decaffeinated, 8 oz (240 mL)            2-10
Starbucks Tazo Chai Tea Latte, 16 oz (480 mL)   100
Stash Premium Green, 6 oz (180 mL)                  26
Iced Tea    
AriZona Green Tea, 16 oz (480 mL)                    15
Generic instant mix, unsweetened, 1 tsp (5 mL)    27
Generic instant mix, decaf., unsweet, 1 tsp (5 mL) 1
Lipton Brisk Lemon Iced Tea, 12 oz (355 mL)         7
Nestea Iced Tea, 12 oz (355 mL)                        26
Snapple Plain Unsweetened, 16 oz (480 mL)          18
Soft drink, 12 ounces (355 milliliters)             Caffeine (milligrams)
7Up, regular or diet                                         0
Barq's Root Beer, regular or diet                        23
Coca-Cola Cherry, regular or diet                       35
Coca-Cola Classic                                           35
Coca-Cola Zero                                             35
Diet Coke and Diet Coke With Lime                    47
Dr Pepper, regular or diet                                42-44
Fanta, all flavors                                             0
Mello Yello                                                    53
Mountain Dew, regular or diet                           54
Mountain Dew Code Red, regular or diet              54
Mug Root Beer, regular or diet                           0
Pepsi, regular or diet                                    36-38
Sprite, regular or diet                                      0
TaB                                                            47
Vault                                                           71
Wild Cherry Pepsi, regular or diet                      38
Sports or energy drink                                Caffeine (milligrams)
AMP, 8.4 oz (250 mL)                                      74
Enviga, 12 oz (355 mL)                                     100
Full Throttle, 16 oz (480 mL)                             144
Monster Energy, 16 oz (480 mL)                        160
No Fear, 8 oz (240 mL)                                      83
No Name (formerly Cocaine), 8.4 oz (250 mL)       280
Red Bull, 8.3 oz (250 mL)                                  76
Rockstar, 8 oz (240 mL)                                    80
Type of product                                          Caffeine (milligrams)
Candy and gum    
Foosh Energy Mints, 1 mint                                100
Hershey's Milk Chocolate bar, 1.55 oz (43 g)           9
Hershey's Special Dark Choc. bar, 1.45 oz (41 g)    31
Jolt Caffeine-Energy Gum, 1 stick                        33
Ice cream   
Ben and Jerry's Coffee Heath Bar, 8 oz (208 g)       84
Haagen-Dazs Coffee ice cream, 8 oz (212 g)         58
Starbucks Coffee ice cream, 8 oz (200 g)             50-60
Medication    
Anacin, Maximum Strength, 2 tablets                    64
Excedrin, Extra Strength, 2 tablets                      130
NoDoz, Maximum Strength, 1 tablet                      200