You can control your Players via an iPhone. The AppStore povides the following iPhone applications:
When you first launch Squidgy, you are asked for the server address. This is the machine your Squeezecenter software runs on. You need to provide the address in numerical form (e.g. 192.168.1.10) and not as a hostname (e.g. macmini.local).
Once there, you have access to the main selection menu (Artists, Albums, ...). A players button allows to select which player you want to control. A Now Playing button allows to see what song is currently playing and to control the player (Play, Pause, Skip...). Tapping on the cover graphics brings down a further menu for Power, Volume, ... and a Wikipedia button. Volume doesn't work. Wikipedia is a nice feature.
The adertisement talks about a landscape mode which doesn't come up in my case.