I can recommend this plugin.
Easy to install, easy to customise and display.

The plugin always searches for tag entries in the default blog and therefore does not find articles (Multiblog scenario).

Example:

Your blog url is http://yourblog/index.php/yourblog/?tag=Internet

You click on a tag and it calls
http://yourblog/?tag=Internet

instead of

http://yourblog/index.php/yourblog/?tag=Internet

which would work.

Will this work with register_globals turned off?

I use b2evolution 2.1.0-beta.

OK, here is the solution to the probem I described above:

Change the following:
Line 61:
From: global $baseurl;
To: global $Blog;

Line 118:
From: … href="‘.$baseurl.’?tag=’. …
To: … href="‘.$Blog->gen_blogurl(). …

Sorry, the above may lead to confusion. Here the corrected lines:

Line 118:
From: … href="‘.$baseurl.’?tag=’. …
To: … href="‘.$Blog->gen_blogurl().’?tag=’. …

Sorry for the 3rd comment in 1 hour. Though the plugin works for me now, there is one issue left. The tags are always related to all your blogs and not only to the blog that you are just viewing. So you need to keep this in mind in case you have a multiblog environment.

Nevertheless, good plugin.

@ Daniel Zelder : i have register_globals turned off and it’s working great for tags in the default blog, tags on another blog don’t work (yet)

Version 0.9.5 released!

Now you can use the Tag Cloud in multiple blogs AAAAAAND it only displays the Tags of the active Blog.

Sorry it took so long and thanks to Daniel for the help :)

Thanks so much for this update, and the new features ! this plugins rocks !!! finally B2evolution get a great tagcloud solution !

An issue I encountered now: if blog is including texts from other blogs on the same system (blog settings->advanced->aggregate), the tagcloud still won’t show tags from those texts.

I havn’t looked into the code yet, if I do I’ll post it here, it’d be a nice thing to fix.

If you found the sollution, please let me know. I’m eager to use the plugin also on aggragate blogs.