Goran Petrovic

This utility plugin allow you to bookmark your site in admin bar.
This plugin is very useful if you have several, local or online, WordPress instalations.You can set up all sites admin bar, from one point.
So, you can jump fast from WP admin to WP admin.
Features
<ul>
<li>Fast jump from WP to WP </li>
<li>Global register sites</li>
</ul>

WP Jump

wanakijiji

Hatena Connectは、はてなブックマークとWordpressブログを結びつけるプラグインです。 
はてなIDを設定すると、このWordpressブログがブックマークされた際に以下のサービスに通知が届きます。
<ul>
<li>はてなサイトの「あなたへのお知らせ」</li>
<li>はてなアプリの「通知」</li>
<li>Chrome拡張機能の「はてなのお知らせ」</li>
</ul>
Hatena Connect connects your wordpress blog with Hatena. 
You’ll get notifications on the following service when someone bookmarks your wordpress blog.
<ul>
<li>“Notifications for you” on Hatena Website</li>
<li>“Notifications” on Hatena App</li>
<li>“Hatena Notify” Chrome Extension</li>
</ul>

Hatena Connect

Connect your wordpress blog with Hatena to get notifications on Hatena website, app, chrome extension.

WP Jump vs Hatena Connect