The Internet has made it possible to see more of this, because Islamic radicals have found the Internet a cheap way to reach supporters who can either provide cash, or volunteers for terrorist activities. (StrategyPage.com, 10/19/04.)
For examples of terrorist sites, read Rachel Ehrenfeld's article, Shutting Down Cyber-Terror.
I am happy to see that Aaron Weisburd has reached his goal of $3,500 for his Internet-Haganah fund drive. He is good at "confronting the global Jihad online."