Improvements and advice for my Cache class

After reading a bit about the System.Runtime.Caching in the .net 4 framework I've added a simple Cache class to my application.

Can I improve it or add additional useful functionality? Typing it out here I see that the cache checking is somewhat duplicated; could this be refactored?

Note: the two properties SuperUsers and TemplateLocation are just for an example of how the class would be used. Most properties would be a string or list.

/// <summary>
/// Cache class as singleton to make those often used 
/// values that may change just that bit more speedy.
/// </summary>
/// <remarks>
/// Jon Skeets' singleton http://csharpindepth.com/Articles/General/Singleton.aspx
/// </remarks>
public sealed class Cacher
{
    private readonly ObjectCache _cache = MemoryCache.Default;
    public CacheItemPolicy Policy { get; set; }

    private static readonly Cacher instance = new Cacher();

    static Cacher()
    { }

    private Cacher()
    {
        // expiration policy default
        Policy = new CacheItemPolicy 
        {
            AbsoluteExpiration = DateTimeOffset.Now.AddMinutes(10.0)
        };
    }

    public static Cacher Instance
    {
        get { return instance; }
    }

    public string TemplateLocation
    {
        get 
        { 
            var loc = _cache["templatelocation"] as string;
            if (string.IsNullOrEmpty(loc))
            {
                // hardcoded for test purposes
                _cache.Set("templatelocation", getTemplateLocation(), Policy);
                loc = _cache["templatelocation"] as string;
            }
            return loc;
        }
    }

    public List<string> SuperUsers
    {
        get
        {
            var superUsers = _cache["superusers"] as List<string>;
            if (superUsers == null)
            {
                // empty, so stick values in the cache
                _cache.Set("superusers", GetSuperUsers(), Policy);
                superUsers = _cache["superusers"] as List<string>;
            }
            return superUsers;
        }
    }

    private string getTemplateLocation()
    {
        // hardcoded for test purposes
        return @"C:\";
    }

    private List<string> GetSuperUsers()
    {
        // hardcoded for test purposes
        return new List<string> {"John", "Anne", "Mark"};
    }

    public void Clear()
    {
        foreach (var cacheitem in _cache)
            _cache.Remove(cacheitem.Key);
    }
}

and using the class:

string location = Cacher.Instance.TemplateLocation;
List<string> sUsers = Cacher.Instance.SuperUsers;