Wetpaint is a free, hosted wiki; it does not have paid plans. The free plan does however allow you to create a web site with unlimited wikis and unlimited storage.

Free Unlimited wikis - unlimited storage - unlimited bandwidth - free

You can use your own domain name

You are allocated a sub-domain name: www.yourchoice.wetpaint.com and if you like you can use a custom domain name such as www.yourchoice.com.

Wetpaint has one of the few WYSIWYG editors that handles image insertion well, not only is it easy to put images on your pages you can easily set up a slideshow. Wetpaint pages can contain YouTube or Google video. You can use widgets, embedded flash or embedded in i-frame tags. Better still, you can develop your own. No audio is available yet but you can attach files to pages for other people to download.

Support

Wetpaint offers good support to its community of users. It is easy to browse through or search other Wetpaint sites and support questions on the forum are answered promptly and the answers are always useful and encouraging.

My Experience

I created a wiki in about a minute and like the choice of templates. Wetpaint isn’t a fully customizable wiki, and you can’t run it on your own servers, but it is the best hosted wiki I’ve seen so far. Wetpaint is free, although all pages have contextual advertising included on them.