And for those who are new to Skype, here are the other hidden ones:
Some explanations:
(toivo) = Toivo Annus is the name of a former Skype Staff member. He was head of engineering. His "signature" on the Skype Forum was "Dog ate my headset"!
(heidy) = is probably also a Skype Staff member or at least somebody related with Skype. I found this phrase on the Skype Blogs: "I just got off a video test call from a Lufthansa flight over the Atlantic on Boeing Connexion wifi service. I saw Heidy waving to me from the cafeteria in Tallinn."
(kate) = is an alternative to a known and shown emoticon. Try it! But who is this? There was a Skype Staff member called Kate. You can find her 3 posts under the Skype Forum name "Skype-Kate_"
(london) = is also an alternative to a known and shown emoticon. Quite funny!