Outdoor PIR sensor hooked up to a CCTV DVR (Concept Pro VXH264 with 7 various cameras. It replaced a Aver EH1008H-4), relay output hooked up to wireless doorbell for overnight intruder notification. Script running on desktop to provide motion motion detection alerts during dodgy person observation / while distracted with playback / while liaising with police after intrusions. Considering putting the Python script on a RasPi to do the motion alerting & some logging. Reed sensors on my door and letterbox are wired into the DVR - I get emailed a screenshot from the door camera for both sensors, to review on my mobile.
Also WD TV Live, streaming from Mezzmo running on a HP Microserver. Netscreen SSG5 VPN to work.
Pure BugToo DAB radio bedside alarm clock. It's fairly old now, but does the job, despite occasional crashes.
When it gets very cold, I sometimes hook up a long USB cable to a temperature sensor which I seal into the dismantled kitchen extractor fan vent, then I log the temperatures to a database (
http://practsol.com/thum.htm). I really need a proper wireless outdoor temperature transmitter for this - the long cable is quite silly. However, accurate outdoor stuff seems to be fairly expensive, and DIYing with an Arduino is annoying for a noob.
I have lots of random tech stuff which I don't use & could easily sell, but I don't like selling stuff, for some reason. Painball sentry microcontroller, Arduino Uno + relay shield + ethernet shield, six+ GB/100MB switches, PTZ camera I've never used, Snap-On bore scope, memory, Polycom IP phones x2, recentish laptop I've never used, various motherboards, Atom system, lots of spare ADSL routers, Woodstock DAB car radio, three spare Alix boxes (one with blown diode, I think), half-decent SuperMicro 4x2.5" HDD bay thing, box of unused crappy LED light bulbs, boxes of power supplies, unused APC 750 UPS, two huge bags of one specific capacitor (were for Dell GX260s), NTSC (!!) TV camera, "HD" keyring camera (the goodish quality one), at least 12-15 300GB+ working SATA HDDs, an old Xeon server, Slingbox Pro with long-lost PSU & cables, an unused HP Microserver (eventually intend to use as a backup server), various ATX carcasses, old IDE CD-ROM drives... and lots more. I really need to sell stuff. Maybe eventually.