Had stuxnet been coded to infect at will... it would've changed the current way we think about security totally - overnight.
Flame seems to be the new holy grail of virus's
I assume was designed but top notch experts for government espionage, nobody will waste their time getting flame in our house hold pc's. why would they want screen shots of you surfing porno site? anyway flame had to be introduced somehow, i.e in this case disgusted itself as an windows update i think right? my point is, a virus has to be introduced by the user of the pc. it cannot just drop out the sky and infect your pc.
If you get weird emails with attachments DONT open it, donít open links you didnít request for. donít put in doggie usb drives if you not sure, MSE is quiet good for detecting infected usb flash drive's...
Worms on the other hand are a different story. Your machine just has to be on the network to be infected. No human intervention is required. If you have a vulnerability that is open and not firewalled off the worm will be able to spread without you even knowing it.
Due to the abilities of Flame, whoever was infected by it was hand picked. The people that developed it, definitely up'd the game of virus development.