I actually read an article on the BBC Network about caffeine as I had a bet with John - he though tea had as much caffeine as coffee! I so knew he was wrong! But it was a great article and had a table of caffeine content in drinks:

*Coffee (mg/cup)
- instant 61-70
- percolated ground 97-125
*Tea (mg/cup)
- 15-75
*Cocoa (mg/cup)
- 10-17
*Chocolate Bar
- 60-70
* Cola Drinks (mg/12oz can)
- 43-65

It said pregnant women should limit intake of caffeine and another article said that more than 5 cups of coffee a day can have drastic effects on conception - but this is all based on internet info so not to be taken as gospel of course. Might be a good article to tackle when the main site is back up and running!