iPOD How many cds does it really Hold ?any Tips??

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Ear phones for a plane ?
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I would suggest the Sony noise canceling headphones - a bit bulky, but the best of the lot.
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I owned the Sony liked them, read the Bose propaganda, bought the Bose, listened to them and then returned them. Sonics were not near as good as the Sony.
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A friend suggested the ER6's, I then bought them. They were ok, but did not fit well into my ear, plus the sonics were not as good as the Sony. They went back in less than 3 days
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Just bought the Shure e3c's, in addition to not being fun to have them stuck in your ear and listening to a pretzel being chewed, the sound was by far the worst of the entire group. They went back last week.
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When I go on a plane or can handle the bulk of the Sony, I listen to the Sony. When I need something light weight when exercising or just don't want the bulk of the Sony, the Apple headphones sound are good enough.
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Hope that helps
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Apple Lossless and Sure E3c's for me. Make sure and try the different earpieces that come with the Sures. I didn't like the rubber tips, but the foam work great.
Steve

AAC files are actually smaller than MP 3 files, and are better quality. If you digitize your CD's using this compression method you should theoretically (depending on the length of songs you are digitizing) be able to store 10,000 songs on a 40 gig iPod. Apple lossless encoding is a different thing entirely, and is bit for bit an exact copy of your CD,

WAV files are useless and do not have a place in this application. there is no advantage, sound quality wise, of wavs over losslessly compressed files. if you decide that you want no loss in quality, just use lossless compression to save some space and give yourself a lot more room for more music!

I only have a measly 20 GB iPod, but it holds about 3700 songs @ 192kHz AAC/MP3, and for listening to earbuds is fine for me.

I also use mine a lot on planes, and I find the Sony MDR-NC11 active noise canceling earbuds to be great for planes! They cut out the drone of the engines, leaving a much quieter background, so I can listen to music at much lower volumes…saving my batteries for the return trip, and these are small enough to fit into the front pocket of my iPods padded case.