Use the following command to import setting programmatically :

 devenv /command "Tools.ImportandExportSettings /import:<Path to *.vssettings file>"

Using [CommonAppDataFolder]\Microsoft\MSEnvShared\AddIns does the job on any windows version.

Source : http://www.mztools.com/articles/2008/MZ2008001.aspx

Here is a listof sources and tools that I use when looking for information needed to perform a competitive intelligence analysis.
Feel free to share yours.

Organisations around competitive intelligence / Veille : AFNOR, C4ISR (Military)

Social Web Browser : Flock

Internet Archives : WebBackMachine, Google News TimeLine, Google Cache 

Thesis and Scientific documents : Papyrus, Google Scholar, CNRC 

Document Indexing tools : Copernic, Coveo, Vivisimo, InfoSphere

Search Engines : Google, Ask 

Meta search engines : All the web, DogPile, Mamma

Library and books database : Alexandria, Google Books

Subventionned Projects : CORDIS, RECAP (Medical)

Intellectual property :

• Web
  Patent Storm, Google Patents, United States Patent and Trademark Office
  
• Software
  Matheo

Consultant : DigiMind

Industrial Database : GlobalSpec

Library :  ETS , ProQuest

Audit : Fuld

Brainstorming : FreeMind

Wikis : ClearWiki, WikiSpaces