Make eye contact
This may sound like a no brainer but so many speakers spend their time looking at their feet, at their slides, at their notes – anywhere but the audience. If you don’t make eye contact with the people you’re talking to you end up looking like you’re talking to yourself, just like the guy you avoid sitting next to on public transport.
Don’t read the script
Reading word for word from a prepared script is the fastest way to put your audience to sleep. It’s also lazy. Don’t do it. It’s perfectly ok to have some notes jotted down which you glance at from time to time but anything beyond that is a disservice to your audience and to you as a speaker.