For what it is, the tool is great. I too dislike the opening in same window though. Should open into new window. Never want to direct people completely away from your site.

Also, for this to be truly great, it needs to be able to put into every page, not just blog posts. I am developing a site that serves calendars, docs and info, and user communities. These also would be great to have the option for people to bookmark!!!

Make that happen, and you will be making a great tool!