Well, I have a habit of biting off more than I can chew so I've ended up with a ton of Sims projects! My main one at the moment is my Newman 4x4 Dynasty as it's very fun to play and the story is very popular, the most popular I've ever had on here, so I like to update it regularly. I also have a Random Town Jump project that is starting to get off the ground. And then I have a whole load of stories I've started and then never got around to updating or ones I've not touched for months.
Other than that, I mostly spend my time making Sims. At the moment I'm in the process of creating the full cast of Downton Abbey into Sims and that will be followed by Hunger Games characters. I also partake in the CAS and building contests whenever I can but that doesn't really count as a 'project'.
I guess my MAIN project is just my general life, trying to balance Sims with homework, pets, friends, family, cleaning my room and everything else! My life isn't all that busy, yet I still don't be able to find time!