Built-in and custom software
The overwhelming majority of new laptop and desktop computers now come with some parental controls built in to the operating system. For example, the parental control features incorporated into Microsoft's (MSFT) Vista are very comprehensive and maybe all you need. For Mac (AAPL) users, the new Leopard operating system offers similar features. However, if you want more thorough parental controls, or are using an earlier operating system, some of the more popular suites are listed below.

1. CyberPatrol (JAVA)
A program rated highly by many review sites and magazines, CyberPatrol excels for its versatility, allowing customization for multiple users. One catch is that it can only be installed on a single computer, but that might be fine if your family shares a computer. $39.95 to download. Need to renew subscription at the same price after 1 year. 14-day free trial available.

2. Webroot Parental Controls
Another versatile and comprehensive program offering the full range of filtering and monitoring services. $39.95 to download. Good for 1 year and renewable annually at the same price. Also check out Webroot's excellent A Parent's Guide to Online Safety. Download a free version of the handbook, courtesy of The Online Mom.

3. Safe Eyes
A good choice if your home has more than one computer, since Safe Eyes can be installed on up to 3 systems. A product of SafeBrowse (a company which has previously partnered with McAfee (MFE)), Safe Eyes's remote changes become effective immediately -- helpful if you're at work and your child needs extra time online or to access a blocked site. $49.95 to download. Good for one year and then $49.95 annually to renew.

4. Net Nanny
An award-winning application, which excels in ease of use. The interface is very intuitive and smooth for parents to set up and maintain. Sold for single computers at an annual subscription of $29.99.