I just found that Arrays, Lists, Collections all have these Find, FindAll, etc... functions that use the Predicate syntax.  I guess I've noticed them a few times but never actually tried to use them.  Check this out.

static void Main(string[] args)
{
   // List of Integers
   int[] intArray = new int[] { 1, 5, 10, 2, 15, 100, 20, 30 };
   int[] intFilter;

   // Get all the integers that are less than five [using inline predicate delage]
   intFilter = Array.FindAll<int>(intArray, delegate(int testInt) { return testInt < 5; });
   DisplayIntList(intFilter);

   // If I reused it a lot I can turn it into a function
   intFilter = Array.FindAll<int>(intArray, LessThanTen);
   DisplayIntList(intFilter);

   // If I wanted to pass in the limit I'd have to create a Predicate
   intFilter = Array.FindAll<int>(intArray, LessThan(50));
   DisplayIntList(intFilter);
}

static bool LessThanTen(int testInt)
{
   return testInt < 10;
}

static Predicate<int> LessThan(int limit)
{
   return delegate(int testInt) { return testInt < limit; };
}