Why does List<string,bool> not work?

There are countless ways to do this, and from the sounds of your issue, using a Dictionary is definitely not one of them. I may be mistaken, but it sounds like you may have several keys that have the same values. A Dictionary is, well, a dictionary! You need to have a way to differentiate the items within it, but without sacrificing the integrity of its data.

What you have right now is probably pretty close to the best; why not use that? You could make your own class (called an ArticleCollection or something) that inherits directly from List<Article>. I'll give a sample demonstration. Other than that, what you have is pretty much as good as it gets; the List class only has one type parameter, and for good reason.

public class Article
{
     private System.String _article;
     private System.Boolean _filtered;
 
     public System.String Article
     {
          get { return this._article; }
          set { this._article = value; }
     }
 
     public System.Boolean IsFiltered
     {
          get { return this._filtered; }
          set { this._filtered = value; }
     }
}
 
public class ArticleCollection : System.Collections.Generic.List<Article>
{
     // Call base constructors so your class will basically be identical to the List<Article> class
     public ArticleCollection()
          : base() // Unnecessary, but clarity is always good
     {}
     public ArticleCollection(System.Int32 capacity)
          : base(capacity)
     {}
     public ArticleCollection(System.Collections.Generic.IEnumerable<Article> collection)
          : base(collection)
     {}
 
     // Not required, but this is a prime case for iterators. Figured I'd include one for you :)
     public System.Collections.Generic.IEnumerable<System.String> GetTitles()
     {
          foreach(Article art in this)
          {
               yield return art.Article;
          }
     }
     // Add whatever more functionality you need
}

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