So just a few days about there was a new MSN Worm - BlackAngel.B, before that the Yahoo! e-mail worm, long before that of course the MySpace worm and a few others not notable enough to mention.
And of course plenty of nasty Trojans.

A new Internet worm capable of stealing bank details and other personal data [...]

I remember some time back Netcraft developed an anti-phishing toolbar for Internet Explorer Exploder and Firefox.
You can check it out here:
Netcraft Toolbar

Protect your savings from Phishing attacks.
See the hosting location and Risk Rating of every site you visit.
Help defend the Internet community from fraudsters.

Then recently Google has come out with the Safe Browsing Extension for [...]

Internet search giant Google Inc.’s controversial expansion into China now faces possible trouble with regulators after a Beijing newspaper said its new Chinese-language platform does not have a license.
The Beijing News reported on Tuesday that Google.cn, the company’s recently launched service that accommodates the China’s censorship demands, “has not obtained the ICP (Internet content provider) [...]

Google has offered multiple reasons why it shouldn’t have to comply with a Justice Department subpoena. One is privacy. An excerpt:
If Google is forced to compromise its privacy principles and produce to the Government on such a flimsy request, its search query and URL data, Google will, without a doubt, suffer a loss of trust [...]

With the advent of Web 2.0 and more powerful, user friendly web applications, security and privacy concerns have increased.
Moreso with the new version of Google Desktop coming out, although this is not strictly a web application, they will be storing your data online.
Yes, version 3 adds the ability to “access your documents from anywhere”, or [...]