1) At home on the PC in MP3 form, through the speakers ofcourse. I use my MP3 player when out and about, riding my bike, or working out.
2) 95% of the time, FULL ALBUMS! On the odd occasion I'll skip tracks I really don't like. For example, I'm listening to Drudkh's Blood in Our Wells as I type this, and like every other time I've listened to it, I skip the first and last track. Also, as my MP3 player is many years old it only holds 256mb! So I mix it up a bit on there. Usually only has 1 or 2 tracks from each band.