IIS 7
Go go go ! lazy to type :) read the story here and the top 6 features -
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-Modularized Webcore allows you to add and remove functionality based on your needs. If you only want to serve static content, you need only a few modules (and not ISAPI, for example).
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-A unified HTTP pipeline for native and managed applications alike. You'll be able to use forms-based authentication for classic ASP pages.
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-You can build your own IHttpModule and IHttpHandlers, and plug them into the unified pipeline.
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-A new, distributed XML configuration system that takes advantage of ASP.NET's configuration system.
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-Improved diagnostics and troubleshooting, including new runtime state and tracing features.
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-A new, extensible, task-oriented admin user interface.
Mm.. 6 features? Remember TryIIS.com, there's 6 new reasons posted for why users should pick up IIS 6. So it would be nice to have Top 7 features for IIS 7, agree ? so what's the 7th feature?
-> A new, simplify debugging and tracing mechanism to allow easier application debugging.
Because, it's very hard to know what's breaking the application and most of time it's due to badly written apps, however, the blame goes to the 'bloody IIS' server :)