Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) provides a 27-item checklist to help you evaluate the quality of systematic reviews and meta-analyses.
Standards for Reporting Diagnostic accuracy studies (STARD) provides a checklist for evaluating the quality of diagnostic accuracy studies with a 30-item checklist.
Strengthening the reporting of observational studies in epidemiology (STROBE) statement provides checklists for evaluating the quality of observational studies and conference abstracts.
Critical appraisal tools in a number of languages for various study designs provided by the Centre for Evidence-Based Medicine from the University of Oxford.
An alert system for quality articles on topics that you select. Also contains a searchable database of citations to quality evidence selected by McMaster University.