Yep, registry is your friend.
Packages:
HKEY_CURRENT_USERSoftware<Borcadero>BDS<version>Known IDE Packages
HKEY_CURRENT_USERSoftware<Borcadero>BDS<version>Known Packages
IIRC Known IDE Packages is for IDE extensions, and Known Packages for components (on the Tool Palette)
Library paths are in:
HKEY_CURRENT_USERSoftware<Borcadero>BDS<version>Library
Note:
<Borcadero>
stands for Borland, CodeGear or Embarcadero, depending on your Delphi version.
<version>
is the IDE version, ie 7.0 for Delphi 2010.
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