The Raspberry Pi is a single board computer developed in the UK by the Raspberry Pi Foundation with the intention of stimulating the teaching of basic computer science in schools. The board packs a lot of features, including 700 MHz processor, VideoCore IV GPU and 256 MB of RAM, and only costs $25 USD.
So can it run a LabJack? Absolutely! In a recent forum post an enterprising customer connected a Raspberry Pi to a LabJack U3-HV, and got a simple Python script running.
They are being sold by a few different retailers, but expect delays; LabJack just put an order in, and our source is projecting a 5 month lead time.
More information on the Raspberry Pi can be found on their home page: http://www.raspberrypi.org/