How? The site has fairly static content and as such is only updated on an annual basis at best. I do keep trying to add content to some pages to try and keep the SE's interested in the site. Is there anything more radical I can try to keep the content changing? How much content? How often changed? Every site page or just home page? Any help appreciated.
Why don't you make your website more dynamic? You can use a simple mysql database and code your webpages with php. Another way to make your content change is a forum. There are so many ideas...just use your imagination.
If you really dont have the time to update it, or even put together some kind of dynamic content system, maybe you could put some sort of RSS Feed onto it that displays content from related sites? Its just an idea, but I would think that manually adding new content is your best bet if you can invest the extra effort.
Adding a forum, blog, or RSS feeds are all good ways to provide updated content. Depending on your site's topic, you could also write articles based on it, e.g. "how to" articles, "how it works" articles, "why you should" articles, etc. HTH, Sam