The new default iOS font Elena is really gorgeous. There's a few example retina images in TFA that show you how many more pixels the new ipad has then my (and possibly your) display.
I think Marco Arment licensed those fonts. They don’t come with iOS. Would be nice, though, if Apple were to finally step it up again in the typography department, especially now that they have devices that can show beautiful and detailed fonts off.
I think you misunderstood me and/or I could have been less ambiguous. It's Instapaper's new default font on iOS as stated in the article.
I'm not a big font guy but I've been very impressed twice recently by new web fonts -- first Kottke's redesign using Whitney Screen Smart and now Elena for Instapaper.
