The Internet Explorer 8 Accelerator plugin enables you to post an entry with selected text of any web-page to your WordPress blog.
Please visit http://anantgarg.com/wordpress-internet-explorer-8-accelerator and generate and add the accelerator.
Feel free to contact me at http://anantgarg.com/wordpress-internet-explorer-8-accelerator/
Currently it only works with Internet Explorer 8. However I plan to release similar versions for other browsers.