I played a ton more yesterday. I took out the Bed of Chaos in three tries; it was surprisingly easy. The damage that it deals out though is insane but otherwise, I wouldn't consider it a "boss" fight; it was more of a puzzle. I wonder why people were having a lot of trouble with this one; the Daughter of Chaos gave me more of a run for my money than this thing. But I imagine that in NG+, its hits are probably one hit K.O's.
I also explored a bit of the Kiln of the First Flame (should I spoiler that?). Visually, it looks cool but it's surprisingly short like Crystal Caves is. I took out all the Black Knight (super easy at this point), but I turned back because I'm not ready to call it in just yet.
I also completeled the Big Hat Logan side quest, made a new boss weapon, the Lifehunt Scythe, and finally got the godsend that is the Dark Wood Grain Ring. I did it by aggroing the fire monster in Blighttown which ended up getting stuck between the wall that separates the body guard and Shiva of the East killing him. Unfortunately, I had to take out Shiva of the East after his bodyguard's death caused him to aggro (I bought most of the stuff that he sells).
Now I'm contemplating on what to make with the last three boss souls that I have left (Sif, Iron Golem, and Moonlight Butterfly) and what else to do.
I've tried getting summoned in Anor Londo after joining the Sunlight Covenant but no dice (maybe 360 players just don't want to summon people).
I suppose at this point, all I can do is try to acquire any spells that I can get from the Covenants, get a couple of weapon related achievements, and invade people (using the upgraded Vega style Claw sounds like trolling fun). I might call it a game and take on Gwyn if I get really bored of doing any of that stuff.