What books, pamphlets or other resources would you recommend to folks doing a spot of organising, either at work or elsewhere?
Mine are: -
The Troublemaker's handbook. This is from the US, and written for a US context, but contains lots of advice and case studies about how to get a union off the ground, how to keep it going, and how to stop it all going to shit. Some of it won't be of much interest to anarchos (stuff about "caucusing" within your union branch, and "winning power"), but that's only a small part of it. I got mine mail order from the US for cheap. It costs a fortune on Amazon, and they don't have the most up-to-date version either.
http://troublemakershandbook.org/
IWW Organising ManualFree to download in pdf: -
http://www.lancasteriww.org/IWW_organizing_manual[1].pdf Regardless of what you think about the IWW, there's lots of good stuff here, particularly about the early days of a workplace organising drive, about mapping your workplace and building a network of contacts.
Strike action & Direct action. These are two pamphlets from the Direct Action Movement (the predecessor of SolFed). More explicitly anarcho-syndicalist than the other items on this list, but with an awareness of the pros & cons of strike action (particularly one day strikes), and some alternatives.
Labour Resarch Department guides -- Law at work and Health & Safety . Not the most rivetting reads in the world, but you really do need to know this shit.
Damn these new forums. 
Can comment on articles and discussions
i'm currently compiling a pamphlet/handbook/whatever on legal and H&S stuff for the IWW. remind me, and i can email it to whoever fancies it. (for a reasonable fee, of course
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it'll probably take a few more weeks though, i've got a dissertation to write too!