Curiosity poll - What format do you use & why?

I have been particularly impressed with the quality of OGG. It sounds reasonably good to me (with my portable headphones) at 128kbps. My Fuze is nearly full (mostly 192kbps MP3), so I re-ripped a bunch of CDs to Ogg, particularly the stuff that I plan to leave on the Fuze long-term. Not much really plays this format, so its really just for the Fuze. I re-encoded some purchased MP3 files to Ogg, too. Some people view this as sacrilege to go from one lossy format to another, but I find the compression methods are similar enough that the loss isn’t as noticeable as they claim.