Big Clock Pro is a big analog clock for your desktop that displays the current time and date. The clock can be moved all around the desktop, but you can't adjust the size. This is really uncomfortable, since it is really big and occupies a great part of the desktop. You also can't adjust the transparency, which could be a good solution to the size problem. The clock is nice and of great quality, and it includes six skins to choose from, although the only thing that changes is the color and not the layout, so it is basically the same clock. What you can customize is whether you wish the second hand and AM/PM sign to be visible, if you want hour beeps, show smooth motion, show date, show alarm, and tell hours. The clock includes two alarms: a recurrent alarm and a one-time alarm. You can choose to display a message or play a sound (customizable), or even execute a file, shut down, hibernate or stand by your computer when your alarm is due.
In short, Big Clock Pro is a nice clock for your desktop, but its size is really a problem. However, I suggest you try it and see if it works for you anyway.