The old fashioned way of recording calls consisted of Spy-vs-Spy type tape recorders and suction mics. VOIP changed that a bit, making it dead simple to grab the conversation as it passes through your phone client, although it leaves you chained to the desk.
2ReCall’s 800 number means you can record an outgoing call on any phone. Over the coming year the service will be able to record inbound calls as well, with the ultimate goal being a completely seamless solution that records all calls on the number. (more) DIY wiretap. (more)