Must have components in your robotics toolbox

[zack]

Lets build a list of components/alternatives one must have for building robots... This would be of great help for starters (like me!) Here's a brief classification:

Microprocessor
  Picaxe
  Arduino

Sensors
  Parallax sonar
  Sharp IR
  Deventech Sonar
  Dallas temperature IC

Passives (resistors, caps, transistors)
  330ohms
  4k7ohms
  10K ohms
  LEDs

IC
  555

Tools
  Soldering iron, stand, helping hand
  Breadboard
  Jumper cables
  Crimper
  Wire cutter
  Philips screwdrivers
  Dremel/rotary tool
  Rechargeables
  Battery packs (4 and 3 holders)
  Battery snaps


Connectors (molex, idc etc)
  Molex (male, female and corresponding housing)
  IDC

Mechanical
  Tamiya motors
  Hitec servo
  Tamiya wheel set

If I missed anything, add to this.  I'll keep updating this list

[Rebelgium]

for the sake of clarity, I just want to say it's called an augmented microcontroller. Not a microprocessor.
A microprocessor is a different thing than a microcontroller, and a microcontroller is a different thing than an augmented microcontroller...

[R.O.B. 2.0]

For the

Sensors:
Photoresistors
Small IR line detectors

Passives:
N and P channel MOSFETs

IC:
Motor Driver

Mechanical:
HDPE or another plastic like Sintra(expanded foam PVC(Sintra is great for prototyping))

[Oldbitcollector]

Personal favorites:


Microcontrollers:
Parallax Protoboard w/PropPlug

Servos:
Parallax continuous rotation servos & wheels

[JesseWelling]

Holly Omissions Batman! What about beloved ATmega?

And for tools, a multimeter or and o-scope...