My first 360 got the RROD, and my second one got the 1 ring thing, literally a week after buying it.
Thank god for warranties.
My first 360 got overheated from all the Modern Warfare I played all day straight during the summer. Then it borked and about 3 months later my dad got my bro and I a "sharable" xbox. It hasn't really been... "sharable." But he ordered a 360 Slim with my brother will get (DAMMIT, 250GB HARDDRIVE FFFF), so now we won't fight.