TaskExtensions provides one method OrderByCompletion which orders a sequence of Tasks by when they complete. The approach taken by AsyncEx is a combination of Jon Skeet's approach and Stephen Toub's approach.
TaskExtensions in the Nito.AsyncEx.Synchronous namespace provides a handful of extension methods that enable synchronous blocking of a Task without wrapping its exception in an AggregateException, or without observing the Task exception at all. These are advanced methods that should probably not be used, since you run the risk of a deadlock.