Cool article a friend of mine found on a new telescoping linear actuator that looks like it might see some use with military/ search and rescue robotics.
Article with video:
http://blog.makezine.com/archive/2008/12/situational_awareness_mast_zipperma.html?CMP=OTC-0D6B48984890
Manufacturer:
http://www.geosystemsinc.com/