Skype

60% monthly growth in users
The profile is male and 28; these guys are taking a quarter of their calls via Skype rather than through the mobile network.

Skype revenue is $1.67/user/year, up 9% Y/Y //(March 19th, 2008; source: Tre Italia; http://www.psfk.com/2008/03/25-of-3skypephone-calls-are-web-based.html)//

1.6B Skype Out minutes (+10% Y/Y);
11.9B Skypeto-Skype minutes (+25% Y/Y) //(http://www.morganstanley.com/institutional/techresearch/pdfs/InternetTrends031808.pdf)//