Radek Mezulanik

Plugin show social icons on all page sides. You can choose from 4 icon sizes
Supported social networks:
<ul>
<li>
Facebook
</li>
<li>
Twitter
</li>
<li>
Google+
</li>
<li>
LinkedIn
</li>
<li>
RSS feed
</li>
</ul>

Zedna Social Share Floating Buttons

Show floating social share buttons on the side and size you want.

strx

If you have a classic column site structure, this plugin will make your sidebar follow your visitors while they scroll up and down the page.
Try it <a href="http://www.strx.it" rel="nofollow ugc">Here</a> or <a href="http://www.sulmonte.org" rel="nofollow ugc">Here</a>
Increase ads earnings making them always visible to the user, even when writing a comment on bottom of pages. Let visitors click on sidebar links without having to go up, at the beginning of the page
See also: <a href="http://www.strx.it/2010/11/wordpress-floating-sidebar-plugin/" rel="nofollow ugc">Official Blog Post</a>

Strx Magic Floating Sidebar Maker

Magic Floating Sidebar Maker, makes your bog sidebar floatable.

Zedna Social Share Floating Buttons vs Strx Magic Floating Sidebar Maker