I really feel this is going to be a repeat of the SideKick affair: Microsoft buying them out to get the talent within and to eliminate some of the competition; the Skype service itself will die in the long-run until a successor (founded by Skype employees who jumped-ship, no-less) comes along.
I'm not sure where you're getting this. Skype is joining Microsoft as a business division - that means that it is a top-level business unit organizationally on par with the six others (Windows, Office, Xbox, phones, Server&Tools, and Bing/MSN). That's a clear indication that they are not buying it to scavenge for parts or to fold into some existing product.
Microsoft have already released Android clients for Bing and WLM, by the way.