Solidworks 2009 removes the old tab on the feature tree for Simulation studies, and adds them at the bottom of the screen. It also splits the feature tree to show both the simulation studies, and the feature tree:
You will notice at the bottom of the screen there is a tab named Study 1. When you click this tab, it will split the feature manager and you will now have the stacked feature manager. You can drag that split to create more space if necessary. Click the model tab, and the split feature manager goes away.
Adding a second study will add a second tab:
The tabs are also where you will want to drag and drop items from study to study. If your fixture is going to remain the same, you would simply drag it from one tree, and drop it on the tab of the other study.
One of the best benefits of this new tab layout is that your tree is no longer cluttered with multiple studies like it was in older versions. In 2009, all you see is information about the currently selected study.
Many other enhancements to the overall simulation interface look is covered in the whats new book.