Times have changed. Yes, there are still garage sales, but more and more people are turning to new technology to find effective ways to recycle, reuse, and donate their old technology. Electronics and computers make up a lot of the e-waste that's created nowadays, and it's safe to say that any tech that you can divert from a landfill and either recycle, reuse, or donate will have a major long term impact.
One of the ways to get rid of your old technology that is easily overlooked are social networking sites. From Facebook to Twitter, social networking enables you to connect to people that you may not have otherwise. Thanks to location-based software, these sites can also connect you to people in your own neighborhood, which is perfect when you're thinking about purging some of your old technology items.
A simple tweet or item in a Facebook news feed will usually elicit a response from someone. It's easy to get rid of old computers and appliances this way, especially if you haven't been able to sell them on other sites. This should be your first step, as it lets your friends or people you know be aware of what you're selling. It's surprising how powerful and simple this is.
Then, if that doesn't work for you, you can either post an ad in the Facebook Marketplace or similar section in other social networking sites. Listing something in your local Craigslist is also a good idea. When we were moving and had too much stuff, we used Craigslist to sell off furniture and tech that we couldn't use.
A lot of people like getting second-hand tech because it's significantly cheaper than buying it new. If this doesn't work for you, then you can always try the Freecycle network.