I have been using
Yahoo Widgets when I want to use Microsoft Windows recently. I like its ability to have the widgets show on the desktop unlike Mac OS 10's widgets where you have to hit a button to see them each time. It does however have some rather bothersome annoyances.
The auto update implementation is terrible. It doesn't work right for user accounts, bothering users who don't have the ability to do an update anyway on every startup, then failing to update when you go and try to do the update. Firefox does this the right way, it only bothers you if you can actually do the update, then it downloads and does the update for you with a click.
Three times I've updated, and each time it nuked my widget settings and selections. This is one of the most important things to get right on updates, and unfortunately they failed to implement it correctly. Again, looking at the Firefox example, when you do an update it will verify your extensions for compatilbility and download new ones if needed without losing your configuration.
Another annoyance is, when doing an update, it wants to install all sorts of other toolbars and things and it has these selected by default. Some of these are pretty neat, but I don't want to mistakenly leave one of the ones I don't want installed checked and then have to deal with removing it. At the very least it should remember my past deselections and not make me deselect each of these every time.
Hopefully these things will improve as time goes on. Yahoo Widgets are useful and fun enough that I am willing to put up with these issues, and it is hard to argue with the price.