gnarf

No IE Welcome can react to a Visitor using Microsoft IE (Internet Explorer) of a specified Version. You can
<ol>
<li>Slide Down a Infoscreen (changeable CSS Style) where the User is informed that he should update his browser. All Texts and update Links are defineable in admin menu. No Popup is used, so no chance fpr Popup blockers. You can define a time where the Infowindow hides again automatically.</li>
</ol>
and / or
<ol>
<li>You can use a different WordPress Theme for these users. It can be a Theme that is optmized for IE, or a Theme where you suggest the user to Update / Cange Browser and so on. </li>
</ol>
For Users not affected by the Plugin the source code is not changed. So the Plugin is highly performant and a non IE User doesnt notice the use of the plugin at all.
Easy Installation and configuration.
Also visit the <a href="http://wordpress.losmuchachos.at/no_ie_welcome" title="Plugin Page" rel="nofollow ugc">PluginPage</a>.

No IE Welcome

No IE Welcome allows you to inform Vistors of a specified IE Version to Update their Browser. Also a different Theme can be used for these Visitors.

Adrian Hanft

The Browser Specific CSS plugin is a tool that allows developers to easily target different browsers straight from the stylesheet. Browser Specific CSS adds a short javascript to the head of your page that enables you to use browser specific css selectors. For example, targeting Internet Explorer 7 from your stylesheet is just a matter of defining styles with a “.ie7” selector. Every major browser is supported including code for targeting Macs, PCs, and Linux operating systems.
This plugin uses the javascript written by <a href="http://rafael.adm.br/css_browser_selector/" title="Rafael Lima" rel="nofollow ugc">Rafael Lima</a>. No changes have been made to his code, and all the credit goes to him. Thanks, Rafael!
Changelog: 
Version 0.3 
– Update for compatibility with WordPress 2.9
Version 0.2 
– Corrected readme file.
Version 0.1 
– Features of the first version of this plugin include the ability to turn the plugin on and off and to specify a separate stylesheet.

Browser Specific CSS

The Browser Specific CSS Plugin allows you to easily target specific browsers and operating systems from your theme's stylesheet using regular cs …

No IE Welcome vs Browser Specific CSS