Clark was recently disturbed to learn that your personal info can float out in cyberspace long after you think it has been removed. This is because of caching issues.

Search engines send spiders out across the web to find info that's stored on servers all over the world. Then they present that info to you during a web search.

But the spiders only crawl certain parts of the web every few days or weeks. So info can be stored or "cached" in cyberspace even after it's gone from the original server. In most cases, there will be a lag before it disappears completely.

When it comes to browser security, Clark uses a free tool available at Finjan.com. It prevents him from going to mistyped addresses where danger may lurk, and it goes beyond just looking at URLs to look at the actual code on a page.

Meanwhile, here's one low-tech suggestion to beat keyloggers. A keylogger is a program that gets secretly installed on your computer when you visit bogus websites. It can be used to track every keystroke you make and steal valuable passwords.

This trick involves typing passwords out of order or adding extra characters that you goes back and erases before logging on. Say for example your password is "jane." Instead of typing "j-a-n-e," try typing something like "j-a-x-n-x-e." Then go back and manually erase the extra characters (the x's) using your mouse, not the keyboard, and you just may trick someone who may be remotely monitoring your keystrokes!

RIP-OFF ALERT: Clark recently spoke about protecting yourself online against cyber-criminals. Now technology columnist Walt Mossberg has compiled a handy list that reinforces the message. Below are some excerpts:

• Never click on a link in an e-mail that appears to be from your bank, credit union or brokerage. Call the company if you are in doubt.
• Don't click on links in an e-mail offering free goods or services.
• Never download free software from unknown websites.
• Don't download video drivers from sites other than Microsoft, Adobe or Apple.

Clark also wants to add that you should be using a browser like Firefox, which is safer than Internet Explorer. Please note that it's OK to download new security patches from Firefox.

People have been asking Clark about that website he recently discussed that blocks suspect sites from loading in your browser. It's HauteSecure.com.

Finally, Mossberg also recommends a free service from McAfee called Site Advisor that alerts you when a web address could be dangerous.

Clark loves free services and has 2 new ones to share with you. The first comes from a company called HauteSecure.com, which protects your computer if you mistype a web address. Too often criminals will register bogus domains that may be just one letter off from a legitimate address. When you hit those fake sites, your computer may become infected with a keylogger program. So the free download at HauteSecure.com protects you by blocking sites that could threaten your computer.

The second service Clark has discovered is called ChaCha.com. This free mobile phone service allows you to ask a question by calling 800-2-CHA-CHA. You then receive a text with your answer. It's like Google for your cell phone. So far the results have been hit or miss. While it worked well during a pre-show meeting, it returned a wrong answer when Clark tried it out on air by asking, "Who won the 1964 World Series?" He received a dud answer via text message -- The New York Yankees -- in about half an hour. It was the St. Louis Cardinals who beat the Yanks in 7 games!

Have you been receiving phony e-greeting cards in your inbox lately? If you open these, you might get spyware and others kinds of malware on your computer. Clark is really upset about this trend because e-greeting cards should be a pleasant thing. Unfortunately, something so innocent has been corrupted. The latest incarnation in this rip-off scheme works in the following way: Criminals send out bogus e-greeting cards and if you open it, you download a program that steals e-mail addresses from your contacts list. Once the criminals have those e-mail addresses, they send out another fake e-greeting that appears to be coming from you, staring the cycle all over again. The worst part is that when you opened the initial e-greeting, you probably also unknowingly downloaded a key logger program. This program tracks every key you type, including usernames and passwords for your bank, brokerage or mutual fund accounts. Under the law, you are protected if money is stolen from your bank account, but not from your brokerage or mutual fund account. Some brokers have issued their own policies that allow for customer protection. But the bottom line is that you must run anti-virus and anti-spyware software on your computer. Clark likes Spybot - Search and Destroy, a free program that will eliminate key loggers and other spyware on your system. Hopefully the legitimate e-greeting businesses will find a way to regulate their industry so people can again have faith in their products.