FOGCITYNATIVE  Wonderful little application; but V 1.1r1 does not function properly under OS X Snow Leopard.

While it doesn't crash, it also doesn't work. The calendar will pop up, the cursor is visible and it will highligght the dates or the "i" info icon used to set preferences.

But actually clicking on anyhting does not work; nothing bad happens, but it just doesn't work. The bug is confirmed here:

http://www.charcoaldesign.co.uk/bugtracker

Please if you use this software, click the link and add your vote.

And now that I don't have it, I appreciate how much I use it, so please also consider making a small donation to the author via PayPal. Once he fixes it, I intend to voluntairly make a donation.  
(Version 1.1r1)

FOGCITYNATIVE  Ooops! One more thing . . . after you make your widget, click on the "i" button in the bottom right and UNCHECK the button for "Play Audio Only In Dashboard" and now it plays with Dashboard in the background. Yipee!  
(Version 1.0.6)

FOGCITYNATIVE  I tried the suggestion of editing the included html file but the widget still wouldn't allow me to control it. Clicking anywhere in the widget did nothing.

Here's an EASY solution:

Open this link in Safari 4 beta:

https://www.pandora.com:443/radio/tuner_8_8_0_1_pandora_mini.swf

Go to the menu and select View In Dashboard.

That's it; you don't need this developer's application and his lack of support. You just made you very own widget. Nice and easy.  
(Version 1.0.6)

FOGCITYNATIVE  Version 1.0.6. no longer works, with the File Not found error others have reported. What's worse, the developer's web site has be HACKED and is now rendered useless.  
(Version 1.0.6)