I had SkypeOut for one year during 2007 when they had the $14.95 promotional offer. It worked well enough but I was not using it enough to justify ponying up $36 for 2008. -- I support the right to keep and arm bears.
If your with Comcast they will just give you dropped connections all the time anyways. I use to use skype all the time with friends and family until Comcast got into doing the stuff they do with there customers, havent even tried going back to use it anymore. Was a very good service though I thought.