Resources for review authors
Cochrane Handbook for Systematic Reviews of Interventions - the official guide to producing Cochrane systematic reviews
RevMan web page - documentation and support for software for preparing and maintaining Cochrane reviews
GRADEpro - (GRADEprofiler) is the software used to create Summary of Findings (SoF) tables in Cochrane systematic reviews
Cochrane Style Resource - designed to help you use a consistent style when copy-editing Cochrane Reviews. 
Equity Checklist for systematic review authors.
Re-publishing reviews in other scientific journals: co-publication agreements

Cochrane Diagnostic Test Accuracy Group

Cochrane Methods, the official annual newsletter for methodological issues
within The Cochrane Collaboration

Reporting Guidelines
CONSORT - CONsolidated Standards of Reporting Trials
PRISMA (formerly QUOROM) - Preferred Reporting Items for Systematic Reviews and Meta Analyses
STROBE - Strengthening Reporting of Observational Studies in Epidemiology
EQUATOR Network - collection of reporting guidelines

Training - face-to-face
Contact Cochrane Centres and branches or Review Groups about courses in review production. Events are also listed on the Cochrane workshops page.

Training - online
Online Learning Modules - If you are a contributor to The Cochrane Collaboration, or thinking about becoming one, this range of resources will meet all your training and support needs.

Training resources provided by other organizations:
Centre for Reviews and Dissemination, York

Introduction to Systematic Reviews and Critical Appraisal Course
Identifying the evidence for systematic reviews: an introduction for information professionals