However, with layouts that have a centered fixed-width content block (such as your blog) it is necessary to tweak the browser window size to get a good judge of a page’s visibility. I’m using a wide screen laptop as it would appear that you may have been when you took the screenshot above. Your pages actually would be totally visible on 800 x 600 – using the tool with a maximised window implies the opposite.

Please don’t take this as a criticism of your post – I mention it only to point out something that is not covered on the Google Labs page itself, and I will be feeding this back to them too.

I’ll have to give the Google tool a run for myself. Do you think that the move away from original thinking on vertical scrolling and having important information above the fold – if, indeed, having a fold at all – has anything to do with the evolution of the humble mouse?

For example, earlier mice required you to either move the cursor to the down arrow or the slide bar, then click and hold or click, hold and move the slider down respectively.

As mice evolved in functionality it is now, for example, a simple matter for a user to flick a scroll wheel to ‘travel’ down the page.

There must, surely, be some correlation there?

p.s. I must add that I haven’t forgotten the importance of monitor size and screen resolution in these changes in trends!