While financial gain is certainly a big driver for web hacking, ideological reasons cannot be ignored. Internet organizations, especially hosting providers, suffer more often from the former and government from the latter. Financial organizations might be both, and these attacks are either more frequent or disclosed more often.
Crackers (bad hackers) continue to use the same basic attack schemes–exploiting application vulnerabilities–and they’re becoming more proficient with automation, which makes their attacks more widespread.
Here are some statistics from the Web Hacking 2008 Incidents Database.
Why do people hack? Not the reasons you might think:
How do they get access to your computer:
Who is most opften attacked: