Use gmail and it will show up fast. If you use another mail maybe not as fast, but it varies depending on the server, etc. I doubt it will be a problem for most people, but people are weird sometimes about how fast they think they have to have their email.Personally, I trash most of mine before I read it. Give me your address and I'll send you mine lol.
NO the Hero does not have push email like the Blackberry does. are you using BIS or BES. If your using BES then you can use activesync, touchdown, among other applcications to remain getting your email instantly but im guessing your a BIS user