If I could have only one widget app for my tablet, Wizz Widget would be my choice. Wizz Widget offers a gigantic set of cool and customizable home-screen widgets for all sorts of functions. My favorite is Wizz Widget's Agenda widget, which puts a scrollable view of upcoming calendar events on your home screen (Google has a calendar widget of its own, but it pales in comparison to this one). Wizz includes a few other calendar widget options, along with list- and tile-style widgets for Facebook, Twitter, and Google Reader. The app is free, but certain types of widget customization require a $4.59 "pro" upgrade, which you can purchase via PayPal by following a link within the app.