lots of interesting facts and figures from the Skype Journal. Here’s a sample:

eBay: last year sold a “Gross Merchandise Value” of $44B, representing 14% of all ecommerce on the Net.
PayPal’s highest growth is in “off-Ebay” commerce. Last quarter (Q1-06) “Off-eBay” transactions grew by 59% while overall PayPal growth grew by 43% to $8.8 billion of transactions. On PayPal $1.5 billion of stored value is turned over every three weeks.
Skype, in Q1 of 2006, provided infrastructure for 6.9 billion minutes of long distance calling; representing 7% of all long distance call minutes worldwide.

For the rest see the original Skype Journal piece.