JFLibrary - DateSpan Calculate the difference between two dates in years, months and days. Details: http://joelfillmore.com/years-and-months-between-dates/ - TimeSpanSemaphore Limits concurrent callers during the specified timespan. Useful for rate limiting web API calls. Details: http://joelfillmore.com/throttling-web-api-calls/ JFLibrary.Azure - CloudBlobUtility Create gzip copies of css and js files. Set content-type and cache-control headers. Blob exension methods Details: http://joelfillmore.com/serving-gzip-compressed-content-from-the-azure-cdn/