I wrote this post a while back. The content can still be relevant but the information I've linked to may not be available.
Firstly, Tipsy is the tooltip script used by Facebook and Twitter to enhance the normal title attribute on links. However, just because these big guys are using it does not mean that you should use it without due consideration. If it fits what you are doing, go ahead and use it. It’s a neat tooltip script and rounded corners (using the border-radius property) and a subtle fade effect are also possible with Tipsy.
Secondly, one way of showcasing your content in a restricted space is to use a slider effect where the user clicks through several ‘slides’ of your valuable content. This effect has been used a lot recently but it’s great for showing website portfolios or images. I think it’s also great for showing text and image content. A slider effect can be great for website visitors and for search engines if you are using text in this way. The slider effect that I have been using is Easy Slider. This script has gone through several iterations now and it has a wealth of flexible configuration options. Just about everything has been thought of. Great work!
In both cases, these scripts provide added enhancements for your website visitors. I’ll let you know when the website examples I am working on go live.