> If you want to build something you could attach to your gumstix, you > could look at some various audio codec's. The AIC33 from Texas > Instruments comes to mind -- I think that's available in a 5x5 or 6x6 > array. 8x8, but they only use the outer two rows. I've discovered that many TTL latches are available in small BGA, like the venerable 74373.