Andy Abramson points out a little detail in the SkypeOut user policy that is sure to inflame many SkypeOut users: SkypeOut credits expire if they aren't used for a period of 180 days.
I purchased 10 euros worth of credits for use the last time I was in Europe. While over there last fall I used at most 1.75 euros. I'd always assumed I could use the rest during my next trip later this year, but now thanks to Andy I see that my unused credits were 90 days or so away from expiring. My only saving grace being an accidental SkypeOut call I made when clicking on the wrong user about 3 months ago, had I not done that, my credits would have expired already.
Skype is going to generate a lot of badwill over this policy. It ought to be changed, if one purchases credits they ought to be available for a lot longer than 180 days, and should never expire as long as the Skype accunt is actively used.