The Logic Pirate is an inexpensive yet capable open source logic analyzer. For just 30 bucks it can sample 8 channels, 256K samples per channel, at a blazing (overclocked!) 60 MILLION samples per second! It’s designed to support the SUMP logic analyzer protocol on Jawi’s open source software that works on most platforms.
Its big brother the Logic Sniffer is great, but this little one looks more appropriate for simpler sniffing of all digital things, and more portable (always appreciated for hackers on the move).
Source: Dangerous Prototypes.