The most important thing is to be consistent in your usage. It is annoying to have to remember which tables are plurals and which are not. Same thing with your field names, pick one stadard and use it. Don't make the poor developers have to determine if this table uses person_id or personid or peopleid or person$id, etc. It is amazing the amount of time you can waste when you don't have standards trying just to remember which table uses what.
