On behalf of the IronPython team, I'm happy to announce the final release of IronPython 2.7.4. This release includes everything from IronPython 2.7.3 and earlier. Like all IronPython 2.7-series releases, .NET 4 is required to install it. Installing this release will replace any existing IronPython 2.7-series installation. Assemblies for embedding are provided for .NET 3.5, .NET 4, .NET 4.5, and Silverlight 5.

Improvements in IronPython 2.7.4 are mainly a collection of bug fixes, many of which are directed at getting IPython working. The complete list of changes is also available. Specific improvements include:
Android and Silverlight 4 assemblies have been dropped from this version. The Android assemblies need some more work to be usable with Xamarin.Android, and Silverlight 4 is just plain dead.

For Visual Studio integration, check out Python Tools for Visual Studio which has support for IronPython as well as CPython, and many other fantastic features.

IronPython 2.7.4 is also available for embedding via NuGet. The main package is IronPython, and the standard library is in IronPython.StdLib.