The webcams refresh every 10 seconds. To get your hackerspace's camera here, add it to this list and then notify Will.
Also see the Alpha One Labs Ustream Matrix -- this page is just for non-Ustream cams.

Ace Monster Toys (California US)
Appleton Makerspace (Wisconsin US)
Artifactory (Perth AU)
Hack Manhattan (New York US)
HeatSync Labs (Arizona US)
Hive13 (Ohio US)
Quelab (New Mexico US)
Sector67 (Wisconsin US)