Ways of organizing a navigation bar

Horizontal drop down for primary navigation elements seems most intuitive to users in my experience. I think the most important thing is to keep common elements together and enduring - primary navigation elements (home, news, etc) and account option (sign in/out, edit, etc) should be separated and distinct, but they should always be visible and in the same place.

Really? That's just not a good question. Might as well ask, "What are the possible colors a site could use and what are the pros and cons in each case?"

Sorry for the sharp reply but google, yahoo, whatever - go find examples you like, post them back, and then ask for something. This is just too generic.