This site is dedicated to randomisation – the process of allocating things into groups.
There is a range of information available here. There is a section about why randomisation is important and how it fits into an experimental design. There is a summary of commonly used methods as well as some information about those not commonly used.
The purpose of this site is to feature future research into this simple yet important topic and provide useful links to sites and services which are able to help if you need to implement a randomisation process (this could be a clinical trial or any experimental design or sampling problem).