A few likes and dislikes.
My opinion is prefixes are horrible in every aspect. I currently work on a system where the tables are prefixed, and the columns within the tables are prefixed with 2 letter table name acronyms, I waste at least 30 mins each day working on this database because the acronym isn't logical. If you want to denote something with a prefix use a schema owner instead.
Using NVarchar from the start of a project if there is even a slight hint that down the line the text data will need to support multi lingual chars. Upgrading large databases because of lack of forward planning and thinking is a pain and wastes time.
Splitting each condition within a where clause onto a new line for readability (in and not in statements wrapped in brackets and tabbed in.) I think this is the important standard for me.
I worked at one company where a standard was that comma's must always be placed at the start of a line when performing parameter or variable declarations. This apparently made it more readable however I found it a complete nightmare.
