I find that when it comes to plain features the IoC containers out there for .NET are more or less interchangeable. Because our project has been and most likely will be alive for a very long time, we tend to pick one based on "future-proofness". We feel that the one that has most momentum behind it (userbase, support, active developers, documentation) and most likeley will be around in a lot of years to come, should get the job.I find that when it comes to plain features the