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To be frank, I'd consider traveling without some kind of optical drive not just inconvenient, but downright careless.
Burning a CD or DVD while traveling is an easy, non-hassle way of makeing an ad-hoc backup or for sharing data with others. Then there's the aspect of being able to install all that software you get at trade shows like MacWorld Expo right on the spot. ;)
Most importantly, though, I would never travel with my beloved little 12" P'Book without bringing the Apple Hardware Test and the Diskwarrior CDs along just in case Something Bad(tm) happens.
IMHO, this type of convenience and desaster prevention is well worth lugging around those extra 454g anytime.
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