128 is normally considered the minimum level for music - eith 64 as a gerneral minimum for voice.
When I ripped my music I started off with 192 as a good compromise between sound quality and storage space - but now that I have a bigger iPod and a bigger laptop for my iTunes library I wish 'd started off at 256. When iPods and laptops get even bigger I may move to using uncompressed WAVs.
One of the regular posters on this forum, Kozikowski, uses 256 I believe. My son, who is a bit of a purist, always uses 320.
WC