Two Tangos then? Yes, one sits on your iPad, one sits on the iPhone (or iPod).
And when you have two Tangos? One acts as a remote control for the other.
Once installed you have complete access to you iTunes library: playlists, songs, albums, videos, podcasts. The obvious use is remotely controlling your iPad (loaded with music and plugged into a dock or sound system) with your iPhone, though Tango does allow you to set them up with the remote working the opposite way.
At school? I have my iPad plugged into the classroom projector. But this isn’t convenient for stopping starting music and videos. Here’s where Tango comes in. Same setup, but now I have a remote that works wherever there’s a wireless network. (There’s a bluetooth option but this doesn’t work with my 3GS phone.
In practice it’s easy as. The two apps find each other quickly (5-10 seconds) and there’s no apparent lag in operation. You can add a password, disable auto-lock and sync changes to the library.
The remote for the videos is certainly useful, especially when viewing music clips, as pausing from a remote is much more convenient.
Tango costs $5.49, but it’s a solid, well thought out and practical app that should be on your shopping list.