saucecode

Minimalist Tag Cloud is a WordPress plugin that allows you to display your website’s most popular tags, categories or custom taxonomies as a widget or using a shortcode. 
The plugin styles the tag cloud in a minimalist style with the option to include tag count.
You can use Minimalist Tag Cloud as a widget or shortcode.
There are a number of options that you can customise:
<ul>
<li>number of items (tags) to show</li>
<li>type of taxonomies (tags / categories / custom taxonomies) to show </li>
<li>include/exclude a list of tags</li>
<li>smallest and largest font sizes</li>
<li>font size unit</li>
<li>display format (flat / list)</li>
<li>flat format separator</li>
<li>order by and order</li>
<li>show/hide tag count</li>
</ul>
Check ‘Installation’ tab for details on how to embed the shortcode.

Minimalist Tag Cloud

Very nice little widget. After looking through all the other tag cloud plugins this is the one I found most flexible.

It just needs a bit of styling on the way it displays on the backend. But it's not important. It does its job!

Thank you very much :D

Great customization!

Customisable widget and shortcode to display tag cloud with option to show tag count anywhere you want.

skipstorm

This plugin adds a tag cloud widget where you can select multiple tags at once.
ATTENTION! This is a totally different plugin so if you’re updating from the version 0.6.x you’ll have to configure it again. 
Visit the plugin homepage to download the old version if you want to downgrade.
<h4>Update</h4>
1.0.2 
* Bug fix for utf8 slugs thanks to Alexandros 
* Bug fix + template functions, check comments on plugin homepage
1.0.1 
* Bug fix about random order
1.0 
* Now is a multi instance widget 
* Supports modules 
* Added wp cumulus module (flash file courtesy of weefselkweekje and LukeMorton) 
* Any tag size has it’s own css class allowing a better customization 
* Added several options
0.6.2 
* Removed bug causing some tags not to be displayed, thanks to Felipe from turismocoquimbo.com
0.6.1 
* This version removes the tags that will lead to no articles in the add tag list. 
You might want to install wp-cache to avoid performance issues.
<h4>System requirements</h4>
I’ve only tested this plugin on wordpress 3.0 but it should work down to version 2.8 
This plugin requires php version 5.0 or above
<h3>Developers</h3>
This plugin supports modules, check out the files in modules folder if you want to create your custom cloud style.

Sk Multi Tag

This plugin adds a tag cloud widget where you can select multiple tags at once.

Minimalist Tag Cloud vs Sk Multi Tag