General

• IoC Containers Benchmarked: Torkel Ödegaard benchmarks the hottest IoC containers for .Net, including Microsoft's new Unity container. The takeaway: the performance is negligible - usability for you should be the most important criteria.
• The Cost of Abstraction: Ayende Rahien answers the question of whether or not abstracting behind an interface makes a difference for performance. The answer - it doesn't!
• ThreeSharp v1.3 Released: ThreeSharp is a managed library for accessing Amazon's S3 storage service.
• DotNetOpenID 2.0 Released: Andrew Arnott announces the release of DotNetOpenID 2.0, the open source OpenID framework.
• Fluent Repeater: Ever find yourself in a situation where you need to, say, try to read a file, and if it fails, try another 5 times? If so, then this toolkit will certainly come in handy!
• Handle the Unhandled Exceptions Globally: A nice post on how to handle nasty unhandled exceptions across your application.

Asp.Net

• Coder's Journal MVC Toolkit: Nick Berardi has released an MVC Toolkit with some neat features!
• Fast, Streaming AJAX Proxy: Since XMLHTTP is prohibited from making cross-domain requests, a server-side proxy is needed. Omar Al Zabir has put together a nice solution.

WCF

• Hosting a WCF Service in IIS the Right Way: Sahil Malik outlines certain hoops that need to be jumped through in order to host a WCF service in IIS7.