you can use monolingual to remove the extra languages. make sure you deselect your native tongue and dont remove the power pc binaries if you have an intel mac as it will kill rosetta.
the printer drivers are located in /System/Library/Printers so delete the brands taht you do not use.
the GarageBand loops are located /Library/GarageBand/Apple Loops/ so delete them if you dont use GarageBand.