As you all know, Gadget feature was introduced with Vista and has been improved in Windows 7. There are hundreds of free gadgets available for the latest version of Windows, but there are very few that are very useful.
By default, Windows 7 offers several handy gadgets like such as Currency, Feed headlines, Weather, and Calendar. If you are bored or not satisfied with these gadgets, here is a list of useful gadgets for your Windows 7 desktop.
1. Q’s Drive Info: (
http://gallery.live.com/liveItemDetail.aspx?li=acf35094-cde3-440f-9bde-7e29e95223ef&bt=1&pl=1) FREE

2. Alarm Clock: (
http://gallery.live.com/liveItemDetail.aspx?li=221de3ed-f2e4-4133-99e7-69b7d8962a13&bt=1&pl=1) FREE

3. iPhone Battery Meter: (
http://gallery.live.com/liveItemDetail.aspx?li=b93e18ec-bba5-4ba3-ab95-561a9579e6de&bt=1&pl=1) FREE

4. System Volume: (
http://gallery.live.com/liveItemDetail.aspx?li=9a9dbb79-d3ac-4784-a081-8e6b274c6f69&bt=1&pl=1[/b[) FREE

5. Network meter: (http://gallery.live.com/liveItemDetail.aspx?li=bba1f53d-d39c-40cb-b1a6-af47cb3deab1&bt=1&pl=1) FREE

6. Launch Control: (http://gallery.live.com/liveItemDetail.aspx?li=dabd90cc-d1c9-4425-9384-049ffbd5e43b&bt=1&pl=1) FREE

7. Search Google , Bing, Yahoo: (http://gallery.live.com/liveItemDetail.aspx?li=7cd80d00-f06c-4642-b494-04d9b5ca5888&bt=1&pl=1) FREE

8. Auto Shutdown: (http://gallery.live.com/liveItemDetail.aspx?li=314c09dc-bdf5-4f43-b8e5-7a7c6391fa87&bt=1&pl=1) FREE

9. Talking Clock: (http://gallery.live.com/liveItemDetail.aspx?li=1e88cecb-183e-4906-86b4-7e2434db2e7e&bt=1&pl=1) FREE

10. Tweetz: (http://gallery.live.com/liveItemDetail.aspx?li=fb97315b-ca8c-4799-94bc-48c9fc76484f&bt=1&pl=1) FREE

11. Drive Buddy: Insert/eject your CD/DVD drive quickly. (http://gallery.live.com/liveItemDetail.aspx?li=7baeeea3-b83a-4dd9-adfd-3dc2c1fe6e0d&bt=1&pl=1) FREE

12. Adsensor: (http://gallery.live.com/liveItemDetail.aspx?li=ec659abd-eedf-4cb8-abb4-b0fc46b7b207&bt=1&pl=1) FREE

13. Language Translator: (http://gallery.live.com/liveItemDetail.aspx?li=d2f6f699-e4af-4592-8974-0bb11ea69ff7&bt=1&pl=1) FREE

14. Outlook Info: (http://gallery.live.com/liveItemDetail.aspx?li=70fb2f30-af97-4c69-94a5-6b6a713505aa&bt=1&pl=1) FREE

15. Beaker CPU Meter: (http://gallery.live.com/liveItemDetail.aspx?li=0afebcec-2cf7-4794-8e6d-f04a60020aa5&bt=1&pl=1) FREE

16. Toggle Hidden Files: Toggle between show/hide hidden files. (http://gallery.live.com/liveItemDetail.aspx?li=92f1e7c2-2ae6-4dea-8691-bfe79bc9d1b0&bt=1&pl=1) FREE

17. Notebook Info: (http://gallery.live.com/liveItemDetail.aspx?li=03980eb7-62d1-46ba-8057-47dc0c50cc68&bt=1&pl=1) FREE

18. 9 skin battery meter: (http://gallery.live.com/liveItemDetail.aspx?li=4012bb4c-58d6-4038-88ac-29c470dfcbd7&bt=1&pl=1) FREE

19. Wifi Monitor: (http://gallery.live.com/liveItemDetail.aspx?li=a071c8b7-c006-4a87-a0bf-54b3c870f1c2&bt=1&pl=1) FREE

20. Minimize: Use this to quickly minimize and restore windows. (http://gallery.live.com/liveItemDetail.aspx?li=5af8a6a2-89c0-4c4d-9992-4b0952f45fa0&bt=1&pl=1) FREE

Note: These are third-party gadgets. To install a gadget, download and then double-click on the gadget to see the gadget start working.