In what format do you store your audio collection? and why

mp3
— flexibility (software, hardware adaptation)
— relative quality
size
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quality perception depends to a large degree on platforms playback

mp3, TK good value for size/quality (on the player a little space), all the software supports it. I don't have that good of hearing to feel the difference in quality compared to flac.

ape + flac
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Why? Because I love good music. I have a lot of it, about 1.5 TB. Why lossless? Yes, because I don't like my girlfriend to cut off one hand because she sort of can one survive.

Stored in mp3 (320kbps). Tried to rebuild my collection in lossles, but after a few discography I realized that was not for me (at least not now). There are 2 large and a good speaker Microlab (not 5.1 or 7.1), and Monster Beat Dr Dre. Unfortunately, my HTC Tattoo is not able to play lossles and on the computer space-only 500 Gb.
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For:
Excellent quality
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Against:
Heavy volume
Not played everywhere (including at the recently I any Zune Software)
Need good acoustics
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The first two "cons" for me is critical.
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PS. I would really appreciate the invite to what.cd :)

Try all the performers to keep in flac'e or ogg. Also my dad has a record player, a pet plates. But surpassing most of the songs are still in mp3, which is not very happy. The question "why" is not very clear... it is Clear that in FLAC and OGG cooler and clearer, but if not, we have to settle for MP3.

if anything is stored locally — that mp3 only. for flac'a desired sound quality, and I often listen to music or using headphones (lutosawski DR-BT50 from nokievskoy or wired headsets) or portable speakers, home a little less connected to the Soviet set ucilka+columns of Amfiton.

The fact that I can find. Usually it is mp3.