Google have released their trends application some time ago. A neat thing about it is you can now view trends for a particular day.
I have written an application that converts this to a simple XML feed.
Unfortunately its for USA only, but as soon as other countries appear I'll add them.
Feel free to parse this feed and use it on your website. If you add this data to your site somewhere its possible you would get a few more hits to your site, possible, not guaranteed, an SEO tip :P