If your PC and PDA got together, their offspring might look like this: Sharp’s Zaurus SL-5500 is the first digital organizer with a full, hideaway keyboard. To access it, you just pull the top and bottom apart. The Zaurus, which was first demonstrated this year, also features a 320- by 240-pixel high-resolution screen, Compact Flash and SD card slots, and 64MB of memory. It’s the coolest case of convergence we’ve seen in years.