If you've read this post about the new features into Microsoft Application Virtualization 4.5 then you're probably already aware of Dynamic Suite Composition (DSC) and how it can really streamline your virtualization projects.  Whether you consider yourself a DSC expert or not, check out John Behneman's overview and example below.  He does a great job of explaining what it is, why it's so cool and how to use it:

Dynamic Suite Composition (DSC) provides a method for administrators to control which virtual applications will be combined to create a unified, virtual working environment for a single application set. To do this, DSC provides a way for the admin to specify mandatory or optional dependencies between separate virtual applications that allows each app to run within the same virtual space, or "bubble" as we call it. When this is used, when the primary virtual application is run on the client it will also launch the dependent virtual application within the same bubble, allowing the combination to run together in the same virtual environment.

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Dynamic Suiting Composition DSC References

• Dynamic Suite Composition (DSC)
• How to use Dynamic Suite Composition (DSC) in Microsoft Application Virtualization 4.5
• Beta 4.5 Getting Dynamic Suite Composition (DSC) to work (Client Build 4.5.0.608/Server Build 4.5.0.606)
• The SoftGrid OSD Editor is a GUI tool that supports Dynamic Suiting