The latest figures from Netcraft indicate 2008 ended with 186,727,854 websites. That's a 1.56 million increase over November, and 31.1 million over December 2007.
Interestingly, the growth of websites seems to slow down as in 2007 the Internet grew by 48 million sites and in 2006 the number climbed by 31.6 million. The growth percentage dropped from 42 percent in 2006 and 46 percent in 2007 to just 17 percent in 2008.
There's also an update about the webserver market:
Apache remains the most popular web server on the Internet with 51.24% of all websites running the software. Apache’s share declined substantially in 2007 (down from more than 60%), but has remained somewhat stable this year. Microsoft’s IIS share is estimated at 31.24%, Google at 5.6%, Nginx at 1.80% and Lighttpd at 1.63%. In absolute numbers, 95,251,327 sites are currently running Apache, 63,114,252 Microsoft IIS and 10,450,496 Google GFE.