urbanrevolt, I'd definately be interested in setting up a network of agency workers, though I think that you and I might disagree strongly on what the role of such a network should be.
Personally, I think that networks of millitants, that organise for and support workplace struggle are the way forward. The unions can be useful in the short term at an individual level, but by their very nature, they constrain and coopt working class struggle, they prevent us from taking control of our struggles, because if we do so, they no longer have a role to play.
As a starting point, I think that we need to talk to people within our own workplaces, argue for the necessity and utility of workplace struggle, organise around ongoing grievances (the sort of stuff you talked about in your post before), and develop wider networks and links between workplaces from this that can struggle against larger scale stuff.
Prole.info's stuff is pretty good, but largely theoretical and historical, I've not read anything by them that gives any practical organisational advice.