[robertlaing]

Another piece of advice (equally for live or non-live TV): Keep mentioning your company name in your answers, even if in a normal conversation you wouldn't. This means if your conversation gets edited heavily (which it will if it's recorded TV) you'll make sure to get your company name in there at least once.

[randall]

As a former producer: This is a sure way to never get called back again.

Just be yourself. Act natural. TV needs you, not you doing an impression of someone who you've seen on TV.