If you already have a SQL Server 2008 or a SQL Server 2008 R2 instance then do not install SQL Server Denali as a named instance. If you do so then your current SSIS development environment will be broken. There is a reason there are virtual machines, I recommend using VirtualBox

With CTP1 of Denali, BIDS is still based on Visual Studio 2008, in a later version it will use the 2010 shell.

Anyway if you do install Denali as a named instance this is what happens when you try to create a new SSIS project

Denali SSIS Error

Here is the text

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Microsoft Visual Studio
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‘C:UsersDenisAppDataLocalTemptemp.dtproj’ cannot be opened because its project type (.dtproj) is not supported by this version of the application.

To open it, please use a version that supports this type of project.
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OK Help
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Here is also a small video I created

[video:youtube:hdNeTWHiwW0]

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