The application is available in the Software Center for Ubuntu 10.10 and 11.04, but it's missing for Ubuntu 11.10, 12.04 and 12.10. That's because Wunderlist is not yet compatible with these Ubuntu versions, but it can be manually installed by using some tweaks.

To make it easier to install Wunderlist in Ubuntu 11.10 Oneiric Ocelot, 12.04 Precise Pangolin and 12.10 Quantal Quetzal, I've created a script that does everything you need to run it (for both 32bit and 64bit).

Icon Tasks is modified KDE 4.7 taskbar applet that comes with some of the best Unity / DockBarX features. It supports Unity quicklists, counters and progress bars, window previews with media player controls, comes with DockManager API (you can use the Docky helpers in Icon Tasks) and lots more.

Cairo Dock (also known as GLX Dock) is a launcher / task manager like Avant Window Navigator or Docky and its major advantage is the huge list of applets it comes with: menus (MintMenu, Cardapio, etc.), Drop to Share applet, Ubuntu Me Menu and Messaging Menu applets, keyboard indicator, netspeed, network monitor, notification area, power manager, stacks, terminal, weather, weblets, system monitor and many many more. Also, unlike other docks, Cairo Dock also comes with stand-alone applets meaning the applets don't have to be attached to the dock and you can use them like Screenlets / Desklets.

(Cairo Dock - Tux_n_Tosh theme and some Cairo Dock applets)

(Cairo Dock - Unity-1 theme)

You can add CPU and memory meters to your Windows 7, by using Taskbar Meters, a program that includes two applications: one that shows CPU utilization and another that shows memory.

You can also quick access the Task Manager and the Resource Monitor in order to determine what's slowing down your computer.

Process Hacker is a free and open source Windows process viewer with powerful process termination and memory searching/editing capabilities. It can show you information about processes, services, modules, handles, and more.

While Process Hacker is meant to look and work a little more like the built-in Task Manager, being easy to approach for regular users, it actually has many of the same features as the popular and powerful Process Explorer which you might know.