We enclosed our little front deck this year, turning it into a much-needed entrance to the house (formerly you had to stand out in the rain trying to get the front door unlocked since our door didn't even have a little roof or awning over it). The side-benefit is that, since it is south-facing, it's a nice little passive solar room. In the winter, it heats up nicely (and will do even better once we get finished putting tile in there), and in the summer it keeps our front door shaded from the blistering afternoon Western sun. All in all, it does a great job of passively heating and cooling the entrance to our house.
A little side-benefit is that it functions as a bit of a greenhouse as well. I brought in the last of the pepper plants from the garden in the fall and just picked the last fresh red peppers this week (that's them in the photo!). The last few were a bit small but still delicious. I think the sunroom will be a great spot to put some garden starts as well, and it's about time to get thinking about that now.
Also on the current docket: hubby is pruning the fruit trees, and just started building our cold frames with some glass doors he picked up at a garage sale last summer. Looking forward to expanding our growing season even more!