Make nice Acronyms out of sentences.

Acronym.cs

using System;
using System.Linq;
using System.Text.RegularExpressions;

public static class Acronym
{
    public static string Abbreviate(string phrase)
    {
        // Only letters, hyphens and spaces 
        phrase = new Regex("[^A-Za-z -]").Replace(phrase, "").ToUpperInvariant();

        char[] seperator = { ' ', '-' };
        return string.Join("", phrase.Split(seperator, StringSplitOptions.RemoveEmptyEntries)
            .Select(t => t[0]));
    }
}