Breathing For Dummies (TM):
There's a power called gemstone breath in Dragon Magic that gives you an actual breath weapon. Any breath weapon feats work on it, since it's a breath weapon, and metapsionic feats obviously work as well. It allows you to breathe as a standard action once every 2 rounds, and lasts for 1 round/lvl. If you Extend it or something, you still only get to use it once for every 2 manifester levels you've got.
It's a 4th level power, meaning you don't get it until 7th level, so that means that most characters can't get breath weapon feats until after then. However, since breath weapon feats work for any breath weapon you have, dragonborn (heart) is an excellent way to get these feats early. Preferably on a warforged, since they lose almost nothing and gain quite a lot. It also gives you access to TWO breath weapons to use, and makes for a decent blaster if you get your ML up high enough. Knockdown Power, Entangling Exhalation, Lingering Breath, and Paraelemental Power (Smoke) are incredible here, since you can pile on the saves and status effects with no real downsides to you.
It's a good way to preserve pp while blasting and crippling the hell out of things.