jdblundell

This plugin hopes to make linking to Twitter profiles easier in WordPress posts and pages.
It’s the result of typing Twitter usernames far too often in my blog posts and having to go back and link to them later, typing out http://www.twitter.com/username.
The plugin uses a basic shortcode:
[twitter]
to wrap around Twitter user names.
The plugin will then output the username with a link to their profile, displaying the standard @username format.
In addition, the links can be styled via your sites CSS, using the .twitshort selector.
<h3>Usage</h3>
<ol>
<li>Once it’s installed a quicktag/button labled “twitter” will display in your post/page edit toolbar. Clicking the link will insert the [twitter] and [/twitter] shortcode into your post/page. Simply insert the Twitter user’s name between the two short codes and the plugin will take care of the rest.</li>
<li>You can also insert the shortcode manually around the Twitter username you wish to link to. </li>
</ol>
Example: [twitter]jdblundell[/twitter]

Twitter Link Shortcut

A plugin to make linking to Twitter users easier with shortcodes.

BuddyDev

Brajesh Singh

WordPress Username availability checker for WordPress & BuddyPress checks for the username availability on new user registration screens. 
It assist users & site admins by notifying them using ajax whether the username they entered is available or not.
<h4>Features</h4>
<ul>
<li>Checks for username availability in WordPress Admin New User screen</li>
<li>Checks for username availability on WordPress standard registration page</li>
<li>Checks for availability on BuddyPress registration page.</li>
</ul>
For screenshots & more details, please visit <a href="http://buddydev.com/plugins/bpdev-username-availability-checker/" title="Plugin page" rel="nofollow ugc">BuddyDev Username Availability Checker plugin page</a>
Free & paid supports are available via <a href="http://buddydev.com/support/forums/" title="BuddyDev support forums" rel="nofollow ugc">BuddyDev Support Forum</a>. Please Use BuddyDev support forums for your support requests. We may not be able to keep an eye over WordPress plugin support forum.

WordPress Username Availability Checker

WordPress Username availability checker checks if a username is available or not.

Twitter Link Shortcut vs WordPress Username Availability Checker