This is a project I've been working on for a while and finally decided to pull the trigger on and get published to CodePlex. It will help developers generate code for making different requests against the REST/OData endpoint in Dynamics CRM 2011 and 2013. It will generate code for all the supported actions in the endpoint - Create, Retrieve, Retrieve Multiple, Update, Delete, Associate, and Disassociate and will generate the output code using a basic XMLHTTPRequest or through a few popular libraries like the XrmServiceToolkit, jQuery, SDK.REST, and SDK.JQUERY (in the CRM SDK). You are able to dictate if the request is executed asynchronously or synchronously (where supported) and for querying it handles all the supported functionality of the CRM REST endpoint like top, grouping, filtering and sorting.
Besides being able to generate code the tool will also allow you to execute it right away. That adds some additional benefit because you could do things like update a read-only field on a record without having to either export/import or go into the form editor, remove the lock, edit, and re-lock. This can work well in conjunction with the bookmark shortcut fellow CRM MVP Blake Scarlavai published on popping up the record id without having to grab it from the address bar.