Materials:

Flexinol: http://www.dynalloy.com/index.php
BioMetal: http://www.toki.co.jp/biometal/english/contents.php
Bi-Metal Alloys: http://www.emsclad.com/

Linear Actuators:

Nitinol based solutions: http://migamotors.com/ 
Sub Micro Linear Servos: http://www.micronwings.com/Products/ServoLinearLeft/index.shtml
http://www.micronwings.com/Products/Servo%20Linear%20OriginMi-LSM1300S/index.shtml

Sensors:

Flex: http://www.flexpoint.com/
Stretch: http://www.imagesco.com/sensors/stretch-sensor.html

Control:

Prototyping platform for nitinol and other current-based actuators: http://www.heatit.cc/

Literature:

Most literature can be found in the ACM digial library: http://dl.acm.org/
Click here for a list of publication related to shape changing interfaces which we are compiling.