I made a googly eyed LittleWire - internally it's all deadbugged - no PCB, and covered over with Sculpey and baked (my favourite kind of enclosure). It's been working great - I've been using it as my main avr programmer for about a week and had no trouble. :)
I can't post an image though apparently. Lame. You'll just have to imagine what it'd look like if you entered MGGzC on imgur's site
I also made a ruby library for using LittleWire for all the nonprogramming stuff! I can't yet post the actual url on the forum (says it's spam?) so you have to get to it's homepage via the link on it's github repo for now: https://github.com/Bluebie/littlewire.rb
I'm pretty confident SPI works fine (I tested writing but not reading), but I haven't yet tested if One Wire and I2C/TWI work (In fact I'm pretty sure One Wire won't work seeing as I haven't implemented that yet :P) If anyone uses it for stuff I'd love to hear about it. The library requires ruby 1.9 and libusb, which are easiest to install on Mac OS via Homebrew, and in the usual ways on linux. It supports wiring-style calls like digital_write (or even digitalWrite) as well as more rubyesque syntaxes documented on the site.
Hopefully I can edit this post once the forum program figures out I'm not a spammer :|