Here's a nice slide show about how the Internet is effecting the political activities of American citizens.  The information is based on new research by the Pew Internet and American Life Project. It's more about information-gathering and deliberation than organizing and activism, but I guess you gotta start somewhere.

Here are the key findings:

• Citizen 2.0 voters represent 51% of American voters
  
  • Citizen 2.0 voters are no different demographically
    
  • they considerably different in terms of skepticism towards traditional media and are more engaged with searching and sharing political information with friends and family
  • They search for information online when big news stories occur to get the "real deal" from an unbiased source

•  The Internet imcreases citizen engagement with poltical news
  
  • Citizen 2.0 is more highly engaged in many media sources
    
  • Significantly more likely to leverage online sources
    • 87% visiting news sites to learn about politics and
      
    • 82% using online search to find political information  

• The Internet provides a tool for political deliberation
  
  • Citizen 2.0 is part of large social media networks and will activate these networks to discuss issues important to them, candidates and spark events
    
  • Citizen 2.0 blasts apart the myth that political conversation is taboo; they enjoy talking about their political beliefs and will have twice as many politically charged conversations as the average voter