What are some good gadgets for Windows 7?

[Arcadio]

Specifically, gadgets that show system status: temperature, cpu load, memory usage, etc...

 

[Gooberlx2]

I like these:

CPU/RAM/Temp Meter
Network Meter
Hard Drive Monitor
Calendar
7 Sidebar

 

[KeypoX]

I use the top 2 and weather, photo and weather that came with windows.

 

[TJCS]

I really like Multimeter v2.10 by SFKilla. It is highly customizable and if you are not into that you can just use one of its built-in presets (or find some made by others).

I can't find this gadget at Windows Live Gallery for some reason, but you can download latest v2.10 at his website (top page, mirror download link).