If you use twitter,

We tweet *a lot* about Sencha Touch and Ext JS.

People to follow (Sencha Touch in Action http://manning.com/garcia2):
@ModusJesus (me)
@SenchaMitch (Mitchell Simoens)
@Ademoss1 (Anthony DeMoss)

People to follow (Ext JS in Action http://manning.com/garcia3):
@ModusJesus (me)
@Ggrgur (Grgur Grisogono)
@JacobAndresen