VoIP Telephony Service blog has a list of six ways to block Skype using a variety of products and methods, plus a reference from another blog about a seventh. Most of the methods detect and block P2P (Peer-to-Peer) traffic, so it wouldn't be just Skype that's being blocked, but also torrents and other related applications. It appears that part of the fear regarding Skype is that customers are not sure what Skype is doing because its streams are encrypted. (At least, that's what the VoIP Planet article that is quoted is saying. Tom Keating also has an article from last year with some more indepth info about blocking Skype.
This is sort of what I was trying to get at when when I said that Skype was ruffling feathers. I love Skype just as much as the next Skype lover (and SightSpeed and a few other apps as well). But their lack of an open standard, as well as their relative popularity, is going to ruffle feathers. Phil Wolff gave a good explanation of why there are feathers being ruffled.
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