Barbarians are most powerful (relative to the other classes) at very low levels. The do tend to steal the spotlight early on. An orc barbarian with a greatsword is one of those things that's just one lucky crit away from splattering most low-level opponents; that works for players as well as DMs. If you think you'll be playing anything above 6th level, I would worry more about your feat progression now. Barbarians are feat-starved, and the rest of the party will catch up quickly.

There are a couple of feats that might interest you, for a more battlefield-controlling Barbarian. The first is Imperious Command, from Drow of the Underdark. (You don't actually have to be a Drow to take it). If you use Intimidate to demoralize a foe, they Cower for a round. If a foe is Cowering, they are denied their Dex to AC - which is very good news for your party Rogue. This does require a pretty good Charisma score, though, so if you haven't planned for it, it might not be an option.

Another feat to combine with this would be Intimidating Rage from Complete Warrior. Once per Rage, you can Demoralize as a free action.

Otherwise you'd be looking at the standard lockdown builds - Combat Expertise, Improved Trip, possibly with Stand Still or some other tricks at higher levels. The basic idea is that you use a two-handed weapon (usually a reach weapon, since they threaten more squares) to trip the enemy, then keep them down as the rest of the party pulverizes them.