As some has posted, I would like to see an apartment life type EP, the ability to move things up and down walls, my piano and violin and hot tub, and SEASONS!!! ... that's it for starters.
Oh and did you see that EA might be putting out an SP in Feb 2010? I read it at Snooty Sims. I forgot the name but it's supposed to be high end stuff.
Think about the character who is going to live there: it's not the same a family with lots of children or a single. Hobbies are a good point too, they focus the attention, and when you are fond on a hobbie, it reflects in your house. An artist will have lots of paints, or sculptures, or music... and a technician would like a clean house and its tools at hand.
I have just read it, not all but most of articles, love the way you put together sims2 ans sims3. Unless I have not switched to 3 yet, it's nice to see how many beauties are there for them. And the article about growing children is the best!!