On a slightly related note, what do you think about framing another site's contents? The original article is closer to framing in this respect, i.e. showing stuff in a UIWebView is more analogous to framing.

I am currently developing a content aggregator site, but haven't decided how to link/display original articles. Should I be putting a frame at the top (or display orignal content in an iframe?) so that users don't leave my site, or should I directly link to the original article? I have strong suspicion that doing the former would be unfair, but some sites like stumbleupon do it to improve user experience.

I strongly, strongly dislike stuff like the old Digg bar, or the Reddit bar. I'm assuming that's what you're talking about?

    http://www.reddit.com/tb/fp3vz

If I'm looking at a page, I want the URL to be the URL of the page I'm looking at. Feels quite scummy otherwise.

That said, feel free to do it, nobody can (or should) stop you.

On the desktop, I couldn't agree more. On a mobile device, its a handy shortcut to the pages I will most likely visit next anyway.