If you're a fan of tech, you've probably got the latest, greatest version of everything - and that means you're also likely to have cupboards, drawers and maybe even lofts stuffed with perfectly useful devices that you don't need any more.
If it's in good nick, why not give it as a present to someone else? Let's discover the gadgets that can live again in a new home, and what you need to think about before you get wrapping.
This year's iPhone isn't dramatically different from last year's one, and iOS 9 currently supports devices going back to the iPhone 4S; Android's a bit more complex, but flagships from the last few years generally have Lollipop and many should get Marshmallow.
That means a good condition smartphone is still current, and while it might seem dated to you it's a huge step up for someone who's got a cheap no-name phone they saw in the supermarket.
Remember to wipe your data and settings, and with iPhones you'll need to remove your iCloud account and get the phone's network lock removed.
iPads and iPods
The same factors that apply to smartphones apply to tablets and the iPod touch: if it's fairly recent it's perfectly decent.
The older the device the more issues you're likely to encounter - so for example first-gen iPads aren't supported any more, iOS 9 runs like a pig on the iPad 2 and Apple only supports the fifth-generation iPod touch onwards - but if it's still supported and in good condition then it's a great thing to pass on to a less techy relative.
As with smartphones, wipe the device and remove your iCloud account (if applicable).
We're writing this on a four-year-old Mac laptop and it's a flying machine: by swapping the hard disk for an SSD and popping a couple of RAM chips into it we've made it feel as fast as a brand new Mac.
Even without those upgrades it's a perfectly usable machine that runs the latest Mac OS X quite happily - so perfect for those that thought they could 'never afford' a good laptop.
We've got even older computers running happily too, but for an easy life it's a good idea to stick with configurations that are supported by the most recent operating system - so that's El Capitan for Macs and Windows 10 for PCs.
Xbox 360 / PS3 / Wii U
You've embraced the next generation of gaming, but last-gen consoles are still great gifts: they might not get Halo 5 or Uncharted 4, but almost all the big hitters are available for the previous generation and they cost an awful lot less too.
OK, you'll need someone with a weird appetite for older content, but the preowned market means that anybody with a previous-gen console has access to an enormous amount of games at incredibly low prices.
Not only that, but the previous-gen consoles also bring apps and streaming services to non-smart TVs, so they're as useful for movies as they are for Minecraft.
Let's face it: you bought a Fitbit or a Fuelband, you ran a couple of miles, you pored over the statistics and then you put it in a drawer and forgot about it because exercise is hard.
So why not give the gift of short-term fitness focus to someone else? Just make sure the intent is clear: if the recipient sees the gift of a fitness tracker as a not-too-subtle message - YOU IS FAT BRUV - then your Christmas might not be as merry as you'd hoped.
Then again, if they're chasing you around the sofa at least they're burning some calories.
If Santa's bringing you the Sonos system you've dreamed of or you've gone credit card crazy for the most expensive Bluetooth speakers imaginable, you're bound to know someone who'd be delighted with the wireless speaker you've stepped up from.
Rule of thumb: if it booms and has Bluetooth it's going to liven up the sound from all kinds of phones, tablets or computers.
The exception is if it has a non-removable battery and you've been using it all day and all of the night for years: if the battery runs out of puff when the party's barely started, it's not worth passing on.
While Amazon continues to tinker with its Kindle devices, it does a really good job of supporting the ones it has already sold.
For example, when Amazon introduced the Kindle Paperwhite in 2013 it upgraded the Kindle Touch with the same operating system so that the older device could benefit from the same features as the newer one.
Amazon is very keen on ensuring that Kindle ebooks work on all of its Kindle devices, and that means a used Kindle can be a really great present.
While older Kindles can suffer from old-battery syndrome it's actually very cheap and easy to fix: iFixit has detailed instructions on how to do it here and the going rate for a Kindle battery is around £10 - if it's in good nick, this is a brilliant gift to someone who's never tried an ereader.
For many of us, our smartphones are the only cameras we use - but that's a fairly recent development, and until a few years ago many of us were spending serious amounts of money on digital cameras and digital SLRs.
They're still fantastic devices, and in many cases they still take much better photos than a smartphone can manage.
A good quality point and shoot would be a welcome upgrade for anybody with a cheap digital camera or a crappy cameraphone, while a DSLR with a few lenses could be the beginning of somebody's long love affair with photography.