As the ePlanks 'builders' Anne and I have built strong Personal Learning Networks (PLNs) through various means:

Delicious and Diigo = Social bookmarking (all staff have now got a delicious account)

Classroom 2.0 one of the largest classrooms in the world, sharing about web2.0 and its use.
Twitter - microblogging site


Classroom 2.0
Passionate Teachers
ning in education
Projects by Jen Wagner - some great global projects for mainly primary school teachers
Global education collaborativeprojects
Online projects 4 teachers
Hors Les Murs - Beyond the Walls
Wiki of social networks in education

Networks for Australian Teachers
OzTeachers List

Networks for Language Teachers
Digital Languages Group on Classroom 2.0
Talkabout Primay MFL
In my Reader today I found a post from The Global Education Collaborative about a new Ning network called Language Exchange.
The EFL Classroom
technoLOTE email discussion group

Global Networks for All Teachers
Classroom 2.0
Edublogger WorldThe Global Education Collaborative

How will this improve my teaching?

I can really only answer this by writing about how social networks have improved my teaching
  • ideas
  • projects
  • support
  • motivation
Too Busy to Network?

The more you put in to a network, the more you will get out of it.