Why no journalist died so far in Lebanon war so far?

Probably because we don't have American solders fighting there so there are no journalists (American) covering the story of direct combat. Either that, or because we don't have American journalists there, we don't hear the whole story.

'Cause they've learned to dodge missiles (q.v. Robert Fisk's invu on CBC1 on Friday on how to do this) and wear Kevlar vests. (Shrapnel is a much worse threat than bullets.)

And what about the journalists killed in Lebanon before this? Or the UN observers killed two weeks ago?

Incorrect - an arab photographer has been killed (female), by an israeli rocket