IE 8 Add On

The Google toolbar has one.

Klaw117 said:

Doesn't IE7Pro (which also works on IE 8) have something like this?

IE7Pro - The Ultimate Add-On for Internet Explorer

Re IE7Pro - not yet recommended for Win 7.
Refer -

System requirements

In order to use IE7Pro, you must have one of the following operating systems and browsers installed:
1. 64 MB of RAM

2. 6 MB of free disk space
3. Microsoft WindowsNT /2000 /XP /2003 /Vista
4. SupportInternet Explorer 6.0/7.0 and above

Jacee said:

It works with IE 8
IE7Pro - The Ultimate Add-On for Internet Explorer

No it does not work properly with IE8 contrary to what the IE7pro groupies say in their forum. It fixed the status bar icon issue for IE8 and that's about it. Some, maybe half of the addons will work properly. As to whether the spellchecker is one that does, I don't remember. I do know that if you install it, you better disable the components that will not work properly.

99% of it works (well what I use of it) inc the Spellchecker be it IE8 in Vista or Win7.

Disable the Crash Recovery as IE8 has it and both enabled can be a PIA.