There are a number of remotes for the iPods, that plug into the top of the unit.
Most are RF, which is good in that you don't have to have a line of sight for results, but I got an IR model for mine, so that my learning IR remote could operate it.
There are ones that have more menu functions available, but mine just has Play/Pause, Track Advance and Volume (which controls the iPod volume through the headphone jack, not the line out, which is preferable).
I'm not sure how I would use extra menu functions anyway, without being able to see the iPod display across the room.
There also are some docks available that have remote capability, but some of them actually use the headphone output, so scrutinize them carefully.
You can Google "ipod remote" and get a lot of results.