It's also very useful if you are trying to increase your website's page rank. That alone should be enough. The newest version even blocks popup windows.
Download No! Flash and install it on your computer. A tray icon will enable you to the turn the feature on and off. You'll be amazed how much nicer surfer the web becomes.
Note: The download is free - though you may wish to send a $5 donation to Baryon Lee to help cover the cost of developing the tool.
PDF files are useful for the Internet because they are small to download and allow you to publish content from various sources such as Microsoft Word without worrying about reformatting for HTML.
Invisible Gold includes a template that allows you to upload a list of PDF files, and also includes a link to the Adobe site so your visitors can download the appropriate reader if necessary.
Popup Ad Filter
Download and install Meaya Popup Blocker.
Sign up for the free service - it will probably point out an error before a customer notices it. A year of link checking is $99 - quite a bit more than the other tools featured in this section - though still worth checking out.
Simple Spell Checker
Go to www.iespell.com to download the installer. It's got some quirks - but it is simple and free and does a great job. The only catch is that you need to be running Internet Explorer on a PC.