I don't mean to be too critical as this is pretty cool stuff, but that large calendar is not very good UX. The gradient behind the month, week day tabs interferes with the readability of those words and those giant red x buttons on the events are hideous and not even padded evenly. All I see are those x buttons, and the events aren't padded evenly also bold everywhere.
The tiny calendar then doesn't look anything like the big one, it uses an entirely different gradient and radius for the rounded corners and looks more like jQuery UI.
Like I said it's cool and I appreciate work like this, but a good UI should probably involve good UI fundamentals.
Funny you mention the calendar. First off, I'm a developer, not a designer. When I scrolled to the calendar demo and clicked around in it my initial reaction was 'wow, nice'. Honestly, I see the issues you mention on second glance after reading your criticism. However, I feel sometimes that the drive for pixel perfection is akin to a developer doing too much premature optimization...
"but a good UI should probably involve good UI fundamentals."
That calendar is easy to fix with a little CSS, I have used it. Lack of pixel perfect polish in an example's styling = lack of UI fundamentals, really?
Any decent designer who knows CSS could fix that calendar in a couple hours. Those minor UX details are easily fixable, the bigger picture is you're getting a usable calendar for free.
The tiny calendar then doesn't look anything like the big one, it uses an entirely different gradient and radius for the rounded corners and looks more like jQuery UI.
Like I said it's cool and I appreciate work like this, but a good UI should probably involve good UI fundamentals.