Hi all,
I've posted a few messages here, and I must say that I've been very
happy with all of the help I've received in the past.  So, here goes!

We have one male cat who is about 20 months old.  We've had no
problems with Pico whatsoever; no peeing and no pooping outside of his
litter box.
Last week, we adopted a little girl kitten.  Scratchy is 10 weeks old.
We plan to take her to the vet next week-ish, so I haven't asked them
about this behavior yet.
Anyhow, Scratchy has her own litter litter box next to Pico's and we
think both cats use their litterboxes appropriately (my boyfriend
cleans out both litterboxes daily).
However, last night we noticed pee on the underside of our blanket!
The blanket was on a made bed, but the side with the pee was kinda
dangling close to the floor (it's a big blanket).  There was also a
dry patch of pee a few inches away from the wet patch.  Ewww, and I
just washed the blanket!  Anyhow, we think it's Scratchy who is
peeing, but we can't tell for sure.  Is is possible that Pico could be
peeing there?  He hangs out under the bed, but he's never peed there.
I've seen Pico looking under the bed lately when Scratchy has been
playing around there, but he's also about 3x the size of Scratchy and
I just can't picture him peeing on the blanket from underneath the bed
like that.

For now we're keeping both cats out of the bedroom, even when we
sleep.  I'll also have to pick up that enzymatic cleaner I've been
hearing so much about.  :)

Thanks for your suggestions!