Also, a quick shorthand method in the 330 (works on the McBoeing MD11 / B717 box, too) is to just type the number "1" in the scratchpad and drop it in LSK L1 on the PROG page (the altitude field). Makes the current FCU selected altitude your cruise altitude.
Incidentally, lots of similarities between the FMS's of the Airbus and the McDonnell Douglas boxes (LAT REV / VERT REV, "snowflake" instead of an execute key, McD's FMS speed basically the same as approach-phase managed speed etc). Anyone know why? Always wondered. Sure made the transition easier between the two.