There are a lot of toolbars existing. Microsoft has now updated theirs. I recently made buttons for Google Toolbar and now I've also made one for Windows Live Toolbar. Version 3.0 also supports custom buttons and it was much easier to create the button than for the Google Toolbar. Take a look at the left side of the blog if you want to add this button to Windows Live Toolbar. It makes it easy to access the website, blog and make searches on them.
Onfolio seems like an useful feature. "Easily save, organize and share your online research with Onfolio. Capture copies of pictures, text or Web pages to your PC for reliable access later. Organize your Web research and publish it in emails, blogs and documents. Search through your clippings anytime with Windows Desktop Search." Tabbed Browsing is also of course great for those that don't already have it one way or the other. The integration to easy get maps of addresses that you run into on websites is also a cool feature.