Should I put bypass caps on my servo signal pins?

Or am I not gonna get much bang for my buck doing that?

(I've already tried it, and I'm not srue if I can see any reduction in servo twitching.)

Also, the bare bones arduino reccomends a bypass cap on the AtMega's aRef pin. Is that needed if I'm using the internal 5v reference?

(Again, tried it but I'm not sure if I'm seeing a difference with it on there.)

How about the ARef pin? Does a typical Arduino have a bypass cap on that?

It occured to me the datasheet might have something to say about it, so I checked that. I might as well quote the specific passage here for others that are interested:

The reference voltage for the ADC (VREF) indicates the conversion range for the ADC. Single
ended channels that exceed VREF will result in codes close to 0x3FF. VREF can be selected as
either AVCC, internal 1.1V reference, or external AREF pin.
AVCC is connected to the ADC through a passive switch. The internal 1.1V reference is generated
from the internal bandgap reference (VBG) through an internal amplifier. In either case, the
external AREF pin is directly connected to the ADC, and the reference voltage can be made
more immune to noise by connecting a capacitor between the AREF pin and ground