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From Mike:

Here's a funny thing I always wondered: how much caffeine is in a typical Starbucks Frappucino in comparison to a cup of coffee, or a shot of espresso? I WORKED for Starbucks, and I couldn't find any info on it (although I honestly didn't look very hard).

Well, Mike. Here's what I've found:

Typical caffeine content of various foods
(Caffeine in tea & coffee will vary widely depending on brewing, etc)

Product Size (ounces) / Caffeine (mg)
Starbucks Coffee, grande (16) / 500
Starbucks Coffee, tall (12) / 375
Starbucks Coffee, short (8) / 250
7-Eleven Big Gulp cola (64) / 190
Coffee, brewed (non-gourmet) (8) / 120-180
Starbucks Coffee Frappuccino (9.5) / 98
Coffee, instant (8) / 80
Starbucks Caffe Latte or Cappuccino, grande (16) / 70
Starbucks Espresso, double (2) / 70
Mountain Dew (12) / 55
Maxwell House Cappuccino (8) / 45-65
Diet Coke (12) / 46
Pepsi-Cola (12) / 40
Coke Classic (12) / 36
Sunkist Orange Soda (12) / 34
Vanilla Coke (12) / 32
Coffee, decaffeinated (8) / 3

These numbers come from a couple of different sources (www.kellymom.com/health/lifestyle/caffeine.html, www.cspinet.org/nah/caffeine/caffeine_corner.htm), and seem to match up pretty well.

There's also this disclaimer from Starbucks itself (www.napa.ufl.edu/2003news/caffeinecontent.htm):

The caffeine content of Starbucks coffee varies, according to a written statement provided by spokeswoman Lara Wyss in Seattle in response to a request for comment on the UF study.
Quoting from the statement: “We emphasize that any absolute numbers reported on caffeine levels in Starbucks coffee do not reflect what a customer would receive in every cup of Starbucks coffee. There are many variables that contribute to caffeine content from cup to cup,” including the type of bean, roasting and brewing methods, and grind.

Starbucks regular drip coffees contain an average of 200 milligrams of caffeine per 8-ounce serving; their decaffeinated drip coffees contain an average of 5 milligrams to 11 milligrams of caffeine per 8-ounce serving, according to the statement. A “frequently asked questions” feature on the Starbucks Web site indicated that the company intends to add caffeine-content information to the site in a future upgrade.

So, there's that.
(Note, http://www.starbucks.com does have nutritional information listed for all of its beverages, but that is limited to: serving size, calories, fat calories, total fat, saturated fat, cholesterol, sodium, total carbohydrates, fiber, sugars, protein.

Do yourself a favor: don't look here if you drink a lot of Starbucks.)