Hi jodie, I'm a greenhouse virgin this year too!
Big plans for the winter greenhouse, including:
Carrots like MikeB says
Lettuce-y salad-ey things, mizuna, corn salad (probably more if I look carefully)
Spinach and mustard greens
Possibly broadies to get some early in the year ::)
If we liked them, radishes (but we don't)
Can't wait (only kidding - but really looking forward to the challenge of a four-season harvest :o)