This plugin is for the upcoming Phoenix version of b2evolution. It does not work in the current verion. But, if you have a pre-alpha copy of b2evolution and you want to try it, installation is easy. Just grab this file, remove the .txt from the filename, and save it in your plugins directory:

_bookmarklet2.plugin.php.txt

It works about like the stock plugin Bookmarklet, but it behaves more like the Movable Type bookmarklet that I'm used to. I've never liked making my post title a link, and that's what the stock plugin does. But my version puts the link in the body of the post.