There's a circuit schematic on line that does something similar with far fewer LEDs. It uses a manual pushbutton to feed the first bit and a SR flipflop to repeatedly change the direction of the shift. **broken link removed** In my experiments with various sequencers and LEDs, I often found it useful to build some persistence into the LEDs by adding a few hundred microFarads of capacitance in parallel with each. That way, the lit LED leaves a trail of fading LEDs behind it as it "moves".
Shift register - Wikipedia, the free encyclopedia
just a bunch of these things (a serial in, parallel out shift register of 8 bits will do with 8 shift registers, without needing decoding logic)
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