Leaders in the Economist digital economy ranking. The survey appears to be very thorough - but I would put more weight on productivity improving innovations starting from the highest and massive volumes - invoices, payments, card transactions, accounting automation, e-banking etc.
Also try to measure public-private partnerships aiming at economy of repetition and reuse - but perhaps somewhat less on citizens interacting with the e-public sector - as these transactions take place so seldom (of course it is important to save tax payers money - but these services cannot be habit builders - they should be habit riders).
The journey is picking up speed - 40m new mobile phone users every month, fibre optic capacity doubling every 18 months, Facebook soon surpassing all of the world's e-mail etc etc. Thought provoking.