Bluetooth, firewire and airport are part of the core system - i would advise to leave them well alone, especially Quicktime. Many applications rely on it such as your web browser when playing certain video content.

The real question is why on earth would you want to remove them. Even if you could, the most you'll probably save is 50-100mb tops...

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 Mac OS X 10.6.4 Retail || Intel Core2 Duo E8200 2.66GHz || Gigabyte G31M-ES2L || GeForce 6600 GT 128MB || Realtek ALC883 Audio || Realtek RTL8169 LAN || Samsung SpinPoint F1 1TB HD || Sony Dual Layer IDE DVD RW DW-D22A || Apple Aluminium Keyboard || Mighty Mouse

 MacBook Pro || 2.4Ghz Core 2 Duo || 200Gb HD || 2Gb Ram || NVIDIA GeForce 8600M GT

 iPhone 4 || 16Gb