Linqpad script to parse a directory of .csproj files and dump information about references, both dll and project references, ordered by name and count. Check the to variables at the top, you can display more detail and change from dll to project references by flipping the bit.

ParseCSProjFiles.cs

//iterate a folder and subfolders, find all .csproj files, find all references, count references (by version)
//requires System.Collections.Generic and System.Linq.Queryable


//see each proj or just the statistics?
var showDetail = false;
var projRefs = false;

System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(@"C:\Code\Boomtown");
IEnumerable<System.IO.FileInfo> fileList = dir.GetFiles("*.csproj", System.IO.SearchOption.AllDirectories);
 
IEnumerable<System.IO.FileInfo> fileQuery = from file in fileList
    orderby file.Name
 select file;
 
 var sortedListOfRefs = new System.Collections.Generic.SortedList<string,int>();
 if (showDetail)
 	("Iterating all .csproj file in " + dir.FullName).Dump("Root");
 
 foreach(var f in fileQuery) {
 	 if (showDetail)
  		f.FullName.Dump("Project");
  
    XNamespace msbuild = "http://schemas.microsoft.com/developer/msbuild/2003";
    XDocument projDefinition = XDocument.Load(f.FullName);
    IEnumerable<XElement> references = projDefinition
        .Element(msbuild + "Project")
        .Elements(msbuild + "ItemGroup")
        .Elements(msbuild + ((projRefs)? "ProjectReference" : "Reference").ToString())
        .Select(refElem => refElem);
		
    foreach (var r in references)
    {
		var refName = string.Empty;
		var refVer = string.Empty;	
		var attributes= r.Attribute("Include").Value.Split(',');
		
		refName=attributes[0];
		if(attributes.Length > 1){
			var verAttr = attributes[1];
			var x =verAttr.Split('=');
			refVer=x[1];
		}
			
		if (showDetail){
			if(refVer != string.Empty)
				(refName + " " + refVer).Dump();
			else
				refName.Dump();
		}
			
		var fN = (refName+ ((refVer==string.Empty)? "" : " : " +refVer)).ToLower();
		
		//stash some simple stats
		if (sortedListOfRefs.ContainsKey(fN))
			sortedListOfRefs[fN] = int.Parse(sortedListOfRefs[fN].ToString()) + 1;
		else
			sortedListOfRefs.Add(fN,1);
		 
  
	}
	
	if (showDetail)
		"============================================".Dump();
  }
  
  
	
	List<System.Collections.Generic.KeyValuePair<string,int>> sortMe = sortedListOfRefs.OrderByDescending(o=>o.Value).ToList();
  	sortMe.Dump("By Count");
	
	sortedListOfRefs.Dump("by name");