May be you see it everyday, a seamless-continuous marquee in the Twitter homepage shows the current trending topic. It’s damn good with fading background and short description in a tooltips.
If you like that marquee and want to put it in your website/blog, I have write such script using jQuery and CSS3 I just stolen a bunch of jQuery and CSS code from Twitter, clean it up and made to work standalone. 😀
All you need to do is edit the CSS (marquee width, background, text color etc) and image to fit to your need and drop it into your website or blog.
It’s nothing easier than to try it yourself and the following links will tell you everything.