it's not the end of the world... Flash is already on them, and flash is just as shit - as is RealPlayer and flickr plugin's etc etc....
It's not going to be running by default 100% of the time - that would be stupid, and I can't believe techies would assume that installed=running/crashing, they just spent months improving stability and battery life in the v20 n95 update, they wont just mess it all up at the whim of m$.
I think this is meant to be more of a slap in the face to the iPhone, because any mobile-aimed website built on silverlight that becomes remotely popular will be a 1-up for m$ and Nokia over Apple. Apple will refuse to port it because of "security concerns" - then a year later there will be a new rich-web-application-builder called iLoveWeb or something equally annoying.
Paris - cos she is the nearest thing to an Android on there, which is what my next phone will be running in 2 years! :)