SCOTT_R  Agree with what e_commerce wrote, and a thanks for the tip: Delivery Status is much more polished and useful. Package Tracker only tracks UPS, DHL, and FedEx, and it seems that at least one one of those is always broken (usually UPS). Delivery Status checks far more, and can even check Amazon (and other) package status automatically, *and* you can track multiple packages at once.

The choice is a no-brainer.  
(Version 2.1.11)

KZX72  Wish they'd add USPS.

Also, UPS doesn't work anymore.   
(Version 2.1.11)

CHADWITHUHC  i agree with person below. the ups still wont work for me.  
(Version 2.1.11)

E_COMMERCE  Delivery Status is much more comprehensive.

http://www.macupdate.com/info.php/id/22662  
(Version 2.1.11)

KARL BROWN  always works for me and if there is a problem with one of the links the widget gets updated very useful indeed  
(Version 2.1.11)

LEE325  I have tried this widget and never been able to have ups tracking work, now with this update it is. It seems its not for some others. I have noticed that ups tracking numbers now have spaces in them, that you can see when you track from there website. Try entering your tracking numbers with them, and see if it works for you.  
(Version 2.1.10)

INSOMNIS  The package tracking systems do require frequent updates, but this little widget still rocks for my constant, neurotic tracking needs.

BTW - The download is now correctly 2.1.9 and UPS does work again.  
(Version 2.1.9)

OLDCORPSE  I loved this widget (see my earlier review)... but now I've removed it from my dashboard. In the past few weeks it has completely stopped working. That's 3 versions now, including this one 2.1.8. It doesn't work for Fedex or UPS (haven't had a DHL shipment in a few weeks, so I can't say). I put in a tracking number, and the response is ALWAYS "Tracking number may be incorrect, or the tracking site layout changed." Well, the absurd thing is, if you CLICK on the widget it will take you to the actual page of UPS or Fedex with the perfectly valid tracking number info displayed. Sorry, it's broken, and it's gone from my iBook.  
(Version 2.1.9)

BUZZARD  The last two Fedex shipments (international) that I have tried to track with Package Tracker have not worked. Package Tracker is saying "Package number may be incorrect or the tracking site layout changed". I know the tracking numbers are good since they track in the Fedex site. I wonder if something has changed at fedex.com that has broken Package Tracker?  
(Version 2.1.7)

OLDCORPSE  Nice. I order things all the time, so this is useful. Unfortunatly, a lot of the time I'm tracking stuff from USPS and it would be so useful to have that in this widget... maybe there's some technical reason why it can't be implemented, since I can't believe the develper didn't think of it.   
(Version 2.1.7)