Here’s a comparison chart I’ve been working on that compares various PC-based logic analyzers. I made this mostly for myself because I’ve been wanting to buy a logic analyzer, but most of them are very expensive for a hobbyist’s budget. PC-based ones are a good compromise…they can be cheaper than standalone units since they don’t need all the processing and display hardware. I’m currently leaning towards the $120 Zeroplus unit, it seems to provide the best bang/buck. There is the $50 open source one, but I think I’d wait a bit for more reviews of it, to see how good it really works.
I’ll write a review when I do decide on one. Also I know someone designing his own Logic Analyzer, if/when he finishes, I’ll give a link to that too.