I don't own a logic analyzer and I needed one to debug a circuit, so I made one out of an Uno and Node.js. It's handy despite having a max sampling speed around 20us. In the Arduino sketch I'm pretty sure the four sampling functions can be optimized a little better for speed, and the memory management is a mess (I'm using "Strings" in a memory sensitive application. urgh.). But the serialport/ node.js / html5 path was fun and now I'm using it instead of Perl/Tk or the IDE for several other projects. Feedback welcomed.
http://www.instructables.com/id/Arduinolyzerjs-Turn-your-Arduino-into-a-Logic-Anal/ (I also love how the URL ends with anal. huh huh...) P
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