The new DSO Nano v2.0 portable oscilloscope looks roughly the size of an iPhone yet packs considerable power if you need to do basic electronic troubleshooting in the field. And the price is amazingly sweet - under $100 for the basic unit and a bit more for the 4 channel until they have in the works.
Yes, we have one on order...
"Measuring in at only 3.74″ (W) x 2.44″ (H) x 0.51″ (D), and weighing just 76 grams, the DSO Nano v2.0 is a portable oscilloscope, designed for use in simple electronic engineering work. The compact gadget runs on an ARM Cortex-M3 processor, and displays signals on a color 320×240 display."
DSO Nano v2.0 Puts An Oscilloscope in Your Pocket