Custom Search for your website or blog Provide fast and relevant search results Make money with AdSense for Search Invite your friends and community to contribute Automatically search across links, bookmarks or blogrolls with Custom Search, on the fly Site Search for your business or enterprise Use Google Site Search for enterprise-grade support and optional ads Improve customer retention and conversions on your site Control branding and enhance results presentation via XML results Provide quick indexing of your website via On-Demand indexing http://www.google.co.uk/cse/
Hm...sort of what I was looking for. However, I was looking for more of just a straight-up search function, not google custom search, run directly from my site. Sort of like the internal search XF has. Or, is this not possible without a blog, forum, or other software already set up?
How about http://sphider.eu? I used that in the past, and for it being so lightweight it was fairly powerful and flexible.