I was subbing for a Barbarian player last night, and I realized just how few rages they get. It seems they basically get one per daily power. I also noticed that several of his powers had better effects when raging. What can I do to make the most use of a Barbarian's rage?
For a strictly powergaming answer, of course, you save it for the biggest battle. The "rage-Boost" effect (by which your at-will powers and encounter powers are suddenly getting bonuses due to rage) means - if your'e going to rage, do it as early in the combat as possible. Round 1 if possible.
Second thing: You are a raging madman, but don't hold back from targeting skirmishers and minions when they get in your way. You get a bonus when you drop someone. You are a striker, but that doesn't mean you have to just go after the biggest bad-guy on the field every time.
If you just don't know when the "big encounter" is going to happen- let's say you are doing some general adventuring and don't have a specific villain you are hunting down.. (Which is common enough) consider raging in round 1 of the very first encounter of the game just to sort of show off, and establish your reputation. Your barbarian is still going to be a bad-ass.