The DIY TranceVibe Project
With prices of TranceVibes (Warning: Old article, will be getting updated soon) going all sorts of weird on eBay, it's about damn time someone put a homebrew version together. That's exactly what the The Drmn' Trance Vibe project aims to do.
There's a lot of great information in here on how to develop control schemes for sex toys, written in a nice, easy to read yet sufficiently technical manner. There's also some lovely documentation of the issues you can get into building these sort of things when you don't have a workbench at home, heh.
Great to see other people doing DIY projects like this! Maybe I'll get around to that SexBox v5 tutorial i've been putting off since, oh, February...