TPL Application Block or TPL Helpers
Not sure if this is app block or a helper (like the original and highly popular single file SqlHelper released by p&p circa 2006). Async is hard to grasp (easier with NET 4.5, but still). A higher level simple library that help us implementing common patterns and best practices on top of TPL (sequential/parallel execution, fire and forget, wrap sync libraries, coordination patterns, server side good practices, etc.).
See here for some of the needs: