As a standalone widget it doesn't provide the kind of information that you get in Bjango's full-blown $16 iStat Menus 5, but it may provide enough information to give you a picture of how things are running on your Mac. It's a helpful tool that can tell you when it's time to kill some running apps or free up some hard drive space.
Wunderlist gets even better
Wunderlist (free) was already one of the productivity kings for Mac users. Its integration with Notification Center will be a nice touch for those already invested in the service.
For example, to see if a task is overdue you can just swipe over to Notification Center instead of launching the app. Yes, it sounds like a first-world problem, but it's a one-click (or one-swipe) convenience I appreciate.
Obsess over your packages with Parcel
If you're like the rest of us, when you're waiting for that new iPhone to arrive, you constantly check shipping updates. Parcel (free) can make your obsession easier. Just expose Notification Center, click Add New Delivery, enter your tracking information (and a description of the delivery, if you like), click Done, and you'll be able to easily keep an eye on your deliveries (and lots of them as Parcel supports over 230 services). If you'd like to track more than three packages, Parcel asks that you pay an annual $2 subscription fee.
The future of widgets
Widgets are small, helpful, easy to obtain, and developers are just getting started with them. Keep an eye out for updates in the Mac App Store, as your favorite app could get even more convenient with a slick new widget.
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