Well @chris101, that puts you square out of the most popular of the ATTiny series, being the 45/85, and the 24/44/84 chips primarily. While you can do very cool things with an ATTiny85, it has only three analog or digital inputs and two PWM outputs. The ATTiny24/44/84 lets loose a bit more, with eight general purpose input/output (GPIO) and as the name says, input or output, analog or digital and has a 10 bit ADC. Three more digital input/output, PWM output capability on three set outputs, one digital, two A/D. Another thing that seems assumed is all the extras people describe as "must-have" items, i.e. Crystal or Resonator, associated capacitors and such. These chips do not require anything more than a clean power source connected to VCC and GND. Then can be set to run on an internal 1 Mhz or 8 Mhz clock that will be more than adequate for many applications. There are additional ATTinys in the series, like the 87/167 or the ATTiny43(u) that boast sixteen GPIO, but they are really not all that tiny anymore. In addition, SMD only available, no PDIP like the others. Also, unlike the others, these are really programmed in C/C++ with AVRDude or similar software that is not nearly as friendly as the Arduino IDE. There are easier ways to cut back on pin abuse, like a shift register for a display that can easily control a 16 LED bargraph with just three pins. It also usually ends up simplifying your code and saving memory. You can go on to pretty simple multiplexing to really serious multiplexing using just a few pins also. Who knows, you'll amaze yourself. Happy to respond to questions when I'm available.