Too bad, the original wiki has been lost - forever. I am making up my mind what to do.
The contents of the cookbook are not entirely lost, mainly thanks to the terrific wayback machine.
I've collected the contents of the cookbook into one raw document which is available for download.
I plan to bring the content back online but have no time schedule for that yet. Meanwhile you can download a pdf with the collected articles.
Download synapse cookbook: Synapse cookbook 0.1 (pdf) (raw version)