Ian Fenn's photostream

The idea is that the user can select a category, sub-category or item... but also navigate through the tree. So, if 'Category 1' is EU, they can select that or click the link to bring up EU member countries in column 2. They can then check one of those countries or click a link to bring up the appropriate cities in column 3. All selections are listed in the the fourth column.

The small click area for the checkbox worries me. I'm wondering if there's an obvious solution I'm missing that provides a similar level of 'flow'.

Discovered by @gaijinstu

This is what you might deliver if you try to be far too smart with your website - and this was on the third attempt to load.

By way of comparison, this is an evaluation analysis by the controversial website feng-gui.com. They say, 'Feng-GUI simulates human vision during the first 5 seconds of exposure to visuals, and creates heatmaps based on an algorithm that predicts what a real human would be most likely to look at.'

From Eyequant: "The Hot Spot Map combines the Attention and Coverage Map's information in one view: the bigger the circles, the more salient is their underlying area. More than one circle on one element indicates that the area will most probably be fixated several times - even in the orientation phase."