PS> $list = New-Object 'System.Collections.Generic.List[string]'
PS> $list.Add('foo')
PS> $list
foo
PS> $d = New-Object 'System.Collections.Generic.Dictionary[string,datetime]'
PS> $d.Add('moonshot', [datetime]'7/20/1969')
PS> $d['moonshot']
Sunday, July 20, 1969 12:00:00 AM