In window 7 there is 9 gadgets which are already available for use but other then these gadgets you can download them from windows personalized gadgets gallery.Some must have gadgets are:
.All CPU Meter
This gadget is one of important gadget for window.This provide you task manager as the gadget,When you are using this one you will not need the CPU meter already installed.
All Search
This is another most important gadget for window7 .By using this gadget you will have great search tool on your desktop.This gadget allow you to search on almost every search engine such as Google ,yahoo,bing ,amazon etc.
Auto Translator
This gadget is a translator tool.It can translate into almost every language in world.This gadget need internet connection for functioning.
Battery meter
This gadget is boon for those who uses laptops,notebooks,pda etc, This gadget tell the life of your battery alarm when you need backup for power.
Clipboard Manager
This gadget is clipboard like one available in window.Using this gadget you can add/remove data to clipboard
whenever you want.
Control system with clock
This is control system gadget with clock function .it allows to contol function of your computer.
Drives meter
This gadget tells how much your drives are filled and much they are free.
make your desktop attached social network facebook.Get all updates of facebook at your desktop.
Network meter
Map your n etwork such as lan or home network.