nice link from batboy, lot of common sense replies on it.
AEP you have misunderstood whats happening.
Basically the gadget system is still in windows vista and 7. It has not been removed.
What microsoft have done is removed the function where people can get gagdets that have been vetted by microsoft as clean, so now people have to ge tthem from untrusted sources.
You also have to understand any software someone download's can potentially be a trojan this is not something limited to gadgets.
Finally understand microsoft's recent history isnt pretty they fast getting a reputation for dropping support on things they bring out ot market in favour of newer things.
Personally I dont use gadgets however I can see why people do as it allows for things to be on display side next to running apps.
You see been able to see on screen all the time the status of something as a gimmick?
BT Infinity 2 Since Dec 2012 - Estimate 65.9/20 - Attainable peak 110/36 - Current Sync 71/20