This new version DOES NOT WORK AT ALL.
When you download this version to an Intel Core2Duo Unibody Aluminum MacBook (the latest version, released November 2008) running Mac OS 10.5.6, nothing happens -- the normal OS X automatic widget installer does not startup and attempt to install the widget as usual because, of course, it is a .zip file. So, you double-click the SigAlert.wdgt.zip file and you get a normal looking SigAlert.wdgt file, but still the OS X automatic widget installer does not appear! So, naturally you double-click the widget, expecting it to auto-install, but instead you get a message that says "The file "SigAlert.wdgt" is not a valid widget and you cannot install it."
I tried downloading it from MacUpdate.com and VersionTracker.com, but had the same results. I have used this widget for a couple of years, and I always updated it with no problem when new versions appeared. But this time it just won't work.