Strings:
-Everytime you make a comment, it adds one string.
-Name a switch, add a string.
-Name a unit, building, location, add a string.
Anytime you change the default name of anything, you add a string. You have a total of 1024 strings. It may sound like a lot, but, in actuallity, it's not very many. I.E.
255 Locations = 255 Strings
We'll say 40-60 Units = 40-60 Strings
Map Title,Description, Forces = 4 Strings
Comments = 100-250+ Strings
Switches = 255 Strings.
After adding all of those up, you get roughly around 750 Strings. Now, if you're making an RPG you'll hvae a lot of string issues. But, just be moderate.
Oh, and one more thing, you can re-use strings and all of those goodies with Uberation!