Tag Clouds - are they good for SEO?

I always wondered this - are tag clouds good for SEO? Many people use them. I think they might be good since they have tags in them but I am not sure.

They are just as good as any other internal link, depends some people have flash tag clouds others are pure html.
They are not bad but i would not get over-excited about them. Good i guess if you make good keywords for your tags apart from that its exactly just like an internal link to another page on your site.
But gives something to crawl so its all good

should be no different than a regular link