Out-Clip

Here's the code that I ended up with for OutClip:

using System;
using System.Text;
using System.Management.Automation;
using System.Windows.Forms;
using System.Threading;
[Cmdlet(VerbsData.Out, "Clip")]
public class OutClip : Cmdlet {
    StringBuilder sb;
    PSObject inputObject;
    [Parameter(ValueFromPipeline=true)]
    public PSObject InputObject {
        get { return inputObject; }
        set { inputObject = value; }
    }
    protected override void BeginProcessing() {
        base.BeginProcessing();
        sb = new StringBuilder();
    }
    protected override void ProcessRecord() {
        base.ProcessRecord();
        if (null != inputObject) {
            // add a line break between objects, but not for the last object
            // that should allow one-liners to come through
            // without us adding a line-break, which is often inconvenient
            if (sb.Length > 0) sb.AppendLine();
            sb.Append(inputObject.BaseObject.ToString());
        }
    }
    protected override void EndProcessing() {
        base.EndProcessing();
        Thread thread = new Thread(delegate() {
            Clipboard.SetDataObject(sb.ToString(), true);
        });
        thread.SetApartmentState(ApartmentState.STA);
        thread.Start();
        thread.Join();
    }
}

And here's the code for the snapin/installer

using System;
using System.Management.Automation;
using System.ComponentModel;
[RunInstaller(true)]
public class MySnapIn : PSSnapIn {
    public override string Name {
        get { return "KeithsUtilities"; }
    }
    public override string Vendor {
        get { return "Pluralsight LLC"; }
    }
    public override string Description {
        get { return "A set of PowerShell cmdlets written by Keith Brown"; }
    }
}