[jarin]

It's very useful for top-level navigation when using the "infinite scrolling" that seems to be so popular these days. It makes it so you don't have to scroll all the way back up when you're 10 pages deep.

[riffraff]

how does this compare to having a "to top" button on the bottom of the page which appears when scrolling?

I mean, I understand the difference between showing actual actions or giving more space to content, but I'd like to know of some real studies on it.

[jarin]

It's an extra click

[knewter]

at the bottom...of the infinite scrolling page?

whoosh

[riffraff]

no, at the bottom of the window/viewport when scrolling.

[drharris]

Ah, not a fan of endless scrolling either, so that may explain my feelings here. :)