For those of you who have an iPhone, a very handy new application was launched for it called Fring. Once you've installed it, you can connect to a number of different services like AIM, MSN, ICQ, but most importantly Skype.
With the ability to connect to Skype on the iPhone (through WiFi), you can make very cheap (or free) long distance calls on the iPhone as if it were a normal phone. So, if you're ever wandering around and gain access to an open wifi point, you'll be able to make Skype calls, without using your own phone service. This is an awesome application, and I highly recommend you check it out if you're an active iPhone user. It's very easy to install.