Are you using Parallel LINQ (PLINQ), the Task Parallel Library (TPL), or any of the new coordination and synchronization primitives in .NET 4 (or in the Parallel Extensions June 2008 CTP or with the recent Reactive Extensions release)?  Are you planning to use or are you already using this support in a production application or library?

We’d love to hear about it, and if you have time, what your experiences have been (good or bad).  Please email me at stoub at microsoft dot com… we’re looking forward to hearing from you.  Thanks!