How do they do that?

I dont see any slide show ....

mm167, it's the top block with the right/left arrows on either side.

They're using jQuery, looks like custom written. I "think" the code that does it is in here if you want to study it (if you want to copy, I'd suggest asking permission first): http://cakephp.org/js/common.js

Drupal core comes with jQuery (the same library they are using on cakephp's site), so you can write your own scripts with it, or you can add one of the many jQuery plugins, OR you can install a premade Drupal module that uses jQuery if it does what you need already.

Here's a comparison of modules that are of that sort (of which there are really too many... hopefully in the future some will consolidate their features together): Comparison of Rotator / Slider modules

Though it will take some CSS and styling finesse to get it "like that"... possibly a module to look into that is most like what they are doing there is Views Carousel or Slider module.

The "tabs" widget of jQueryUI can produce similar effect. Here is an example - http://docs.jquery.com/UI/Tabs. You'll have to add two buttons on your own though :-)

@Keyz : Thanks a lot for the "Comparison of Rotator / Slider modules" link. This one looks really interesting.

Thanks for all your suggestions. It looks like it is done with the Coda jquery plugin. This suggests that the 'Slider' module from Drupal will be the best bet, as it implements the Coda tab/slider actions.

I'm going to try this and see how I get on.

Thanks again.