It wasn’t planned that way, but it turned out that I had to write a WordPress plugin myself to solve a problem. I want to have a Google Web Toolkit application run inside my blog. No big deal, but I couldn’t accomplish one tiny detail. GWT applications need a meta tag with the name gwt:module in the page header section. How do I manage to get this meta tag up there whenever a post includes a GWT application?
First, I looked for help where all the WordPress plugins/meta are listed. None of them seems to solve my problem. To be honest, I only looked at a few, so I really don’t know if I’ve overlooked the one I need. One Meta plugin came quite close to what I want, but it was for description and keywords only. Except that, it would have been perfect. So I took its idea and modified it.
You have to use WordPress’ custom fields for storing the gwt:module meta tags. Just create a new custom field when you create or edit a post. The key should be set to gwt:module, and the value should be the path and name of your GWT module. The plugin then collects all gwt:module meta tags for all posts on the page and puts them in the header section of the page.

In case you want to use this plugin yourself, you can download the WordPress plugin for creating gwt:module meta tags from this web site.
Later today, I will write a post that actually has a GWT application included.
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Btw, another WordPress Meta Plugin 1.9 is out, and you can insert custom (meta) tags in your header.