Love Skype...
and the 15 pages of exceptions I have to put into my firewall to avoid my Websense Proxy from sniffing the trafffic and crashing the experience.
There is nothing like "Drop everything and come fix this software for us so we can have a meeting" only to find out you have to exempt every ip address Microsoft owns. This is also a benefit if you are using "Office 365" because it uses the same ignored ips....
What a concept... Lets get email, office documents, etc. coming into the Corporate network without the sticky entanglement of virus/malware protection.
Thanks Microsoft!