As Mark said, this is a irresponsibly drawn schematic. That casts doubts on other parts of the schematic and anything else that author has to say. Someone being sloppy in one area always seems to carry over to other areas.
To answer your question directly, it seems like the author is using 3 digit floating point to specify values. This is the same scheme used on some capacitors and to define the color bands on 5% resistors. The first two digits are the mantissa, and specify a value from 10 to 99. The third digit is the exponent of 10 to apply to the mantissa. You have to guess the units, but it looks like the author is assuming Ohms and picoFarads.
Here are the values from the schematic expanded out:
C180 = 18 x 10^0 pF = 18 pF
R220 = 22 x 10^0 Ω = 22 Ω
C105 = 10 x 10^5 pF = 1000000 pF = 1.0 µF
A little sanity check adds credence to this interpretation. C180 are crystal load caps, and 18pF is right in the expected range. Actually the right load cap values are dependent on the crystal, not the schematic, but 18pF will be good enough with most crystals unless you need the last bit of accuracy. Certainly 1.8pF and 180pF are out of range, so the pF interpretation for capacitance is pretty much confirmed.
I'm not familiar with this chip, but the caps on VCC and UCAP are either for bypass or to hold up a internally generated supply. 1µF for those is quite plausible.
The R220 resistors appear to be in series with USB lines (guessing from the signal names). You certainly wouldn't want more than 22Ω in series with those. The USB chips I'm familiar with shouldn't have any deliberate resistance in series. Check the datasheet.
Now let's look at the circuit at bit. Since there is nothing else on VCC and UCAP, that's not where the power is coming from. This micro appears to be powered directly from the USB power, between UVCC and UGND, which the signal names also hint at. If so, there certainly should be a bypass cap accross those close to the micro, and a larger cap can be a bit further away, probably right at the USB connector. The USB spec allows up to 10µF capacitance between its power and ground. Use at least a good fraction of that.
What is the ground connected to, and how does that relate to UGND? I expect those to be tied together at one point, but there is no evidence of that here. Note that the two switches are between a micro pin and ground. That's OK as long as those pins have internal pullups. Check the datasheet.
So why couldn't this guy draw the schematic like everyone else would and be clear about the part values? Good question. He's either being cutesy, stupid, or has some axe to grind. Either way, it demonstrates poor engineering. Don't you do this. Also, I'd look elsewhere for whatever you are trying to find. You have no way of knowing what you can trust and what you can't from this author.
