What files can i delete?

i'm a new mac user, so forgive my poor mac vocabulary. I just bought a 12 inch powerbook. when i click the 'Macintosh HD' icon on the desktop, it opens up a window w/ a bunch of icons(i count 27 so far) and i'm pretty sure i don't need about half of them. does anyone know which ones would be okay to trash?

Glad it worked. The only files you can trash are the documents in "User Guide and info", even though you'd only gain a few MB. There might be a folder Applications/Installers/, which contains installation files for additional, trial software like FileMaker Pro. Feel free to delete those one as well.
Unless you know what you're doing, never ever touch the hidden files "cores, dev, etc, mach, mach.sym, mach_kernel, ...". It would be like taking the engine out of your car.
You'll be able to reclaim about 500MB by removing unnecessary localization files. By default, Mac OS X comes with 20+ different languages installed. It's cool to be able to switch everything to Korean within 5 seconds. If, however, you don't have any Asian friends, you might want to use Delocalizer .
Don't forget to mark your question as answered.

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