It beautiful, no doubt! But I must admit, it took me a surprisingly long time to figure out what this application does. The landing page doesn't tell me, the screenshot page doesn't tell me either (not by scanning, anyway) (also, every screenshot is two clicks away). In the end, I reluctantly clicked help, and found out.
The nice thing is that Reeder doesn't really need an informative or very user friendly website for promotion. The most important thing on that website is the link to the App Store.
Reeder already sells so well that Apple and the press do all the necessary promotion.
I like Reeder for iPhone/Pad, and tried the recent beta of this. As a Mac app, it seems to have an "overtly custom" UI, which although clearly skillfully put together, just doesn't appeal to me in look or feel. Though the keyboard shortcuts and add-on services were impressively configurable.
The UI seems very iOS-like to me. I wouldn't go so far as to say it feels out of place on my Mac though. I kind of wish they made a mail client. I really like the dynamic-three column view and controls.
Would you like to expound on why it doesn't appeal to you? I would recommend using the application as your main RSS reader for some period of time before making that assessment.
Still, odds are that when someone says HTML5 they are also refering to CSS3. Words aren't neat and just because they have been defined that way doesn't mean they stay defined that way. To fight that at this point is just plain ridiculous.
It's how I access 90% of online textual content. I do not want to be presented with inconsistent, poorly thought out, ad-ridden web site designs. Just the text and images for articles and blog posts. Reeder lets me get in, read, and get out.
Still; very esthetically pleasing.