Using backticks around field names
Using backticks permits you to use alternative characters. In query writing it's not such a problem, but if one assumes you can just use backticks, I would assume it lets you get away with ridiculous stuff like
SELECT `id`, `my name`, `another field` , `field,with,comma`
Which does of course generate badly named tables.
If you're just being concise I don't see a problem with it, you'll note if you run your query as such
EXPLAIN EXTENDED Select foo,bar,baz
The generated warning that comes back will have back-ticks and fully qualified table names. So if you're using query generation features and automated re-writing of queries, backticks would make anything parsing your code less confused.
I think however, instead of mandating whether or not you can use backticks, they should have a standard for names. It solves more 'real' problems.
The only problem with backticks is that they are not ANSI-SQL compliant, e.g. they don't work in SQL Server.
If there is a chance you would have to port your SQL to another database, use double quotes.