I'd look at that Spring 2009 workload a little more closely. How many credit hours is it? How many labs does it entail? If all 3 science-based classes have labs, I'd consider moving the Art/Anthropology course somewhere else. For example, take Art or Philosophy/Political Science in winter when you only have 1 other science course.
It's hard to say whether or not this will be "too much" - for some people, the general ed classes are a breeze while the science classes are challenging and take up most of their time. For others, the sciences are a cinch and they have to spend a little more effort on art or philosophy. I'd still caution about taking more than 2 labs in a semester (assuming all 3 science courses have labs in the Spring) because they suck up so much time.
All said, it can be done and I don't think it looks too bad at all - it might not be a breeze, but it should still be manageable.
Edited to add: My reasoning is that back in my day (eons ago) as an undergrad, science courses with labs were each 5 hours - 3 hours lecture and 2 hours lab, but you actually spent more than 2 hours in lab a week (per class). I'm sure it varies from school to school and class to class, but I found if I had more than 2 labs on my schedule, I was stretched thinner than normal. Some people can take 18-20 hours without blinking (I did every semester of undergrad) - others really need to stick closer to 15 to stay properly focused. That said, I probably could have done a little better in a few courses if I wouldn't have had so much on my plate at once.
