Sometimes you might want to record your customer service calls for your own personal “quality assurance purposes.” Commenter Dopaz points out that the “Digital Loggers Personal Logger Call Recorder” for $54.21 is one option for landlines.
You just have your phone line pass through it and it merrily starts recording your calls. Included software lets you download the recorded calls to your computer for later perusal. It even includes built-in caller ID.
Before using any call recording system, you’ll want to brush up on your state laws regarding doing so.