So, a "getting started" guide and/or cookbook would be great. Another
cool idea: a MySQL -> PostgreSQL migration guide (I'm sure there's
already one out there) that would show "To do *this* MySQL function in
PostgreSQL, use this function/feature/etc." A good example is
auto_increment -> serial. A comparison/contrast of permission would be
good too. I'm sure others can think of more examples.
+1 on this.
This is very interesting from the point-of-view of transitioning MySQL webapps to Postgres. The truth is that for a lot of people, MySQL is their first DB (because of loads of pre-existing software. Refer to my thread "Which CMS/Ecommerce/shopping cart"). When we are ready to move to PG, we are already used to the MySQL way of doing things.
Take for example, the mysql command "show databases". A commonly taught PG equivalent is "\l". But, instead of mnemonics, I suppose "select datname from pg_database;" would be more intuitive and easier to remember. Yes it is longer, but it helps me understand what is going on behind the covers... especially the cryptic "pg_" tables.
Another example is "use <database>" in mysql - I spent a long time searching for a similar command in PG.