I often experience a lot of aggression. I think I experience anger a lot too. I'm not very introspective though, so I'm not always aware of it, but when I am, it feels like the anger is boiling away inside consistently. All I know for certain is that it causes me to feel hostility and contempt towards humanity.
I don't have a problem releasing anger. I'm very outspoken and confrontational. If I'm pissed off about something, you'll know it because I'll tell you straight up (by 'you' I mean whoever is pissing me off). While I do have a short fuse, I'm rarely hot-headed. I don't normally lash out by punching walls or throwing things etc. Most of the time my anger is more of a cold, calm anger, which comes across as more condescending than anything else.
I express irritation more often than anger. When I do get pissed off it doesn't last very long. I get over it very quickly.
Aggression is something I have more issue with than anger. It lasts longer and is much harder to release. It's frustrating to deal with when I can't act on the aggressive urge in the way I really want to (hurt/kill someone). The only thing I can really do is wait it out. Of course, I can do other things as well, like exercise or beat up a boxing bag, but that only acts as a mild release anyway and doesn't really get rid of the feeling.