For users that are using IE6 or IE7, this widget will display a reminder for them to upgrade to a newer version or install an alternative browser.
Due to a lack of support for most modern web authoring techniques both in CSS and HTML, still-rampant use of IE6 hampers web development, and adds additional costs to any project that wants to look remotely similar. Save the developers. Ask your users to upgrade their browsers.
Mildly better in that it supports PNG Transparency, but not by much.