I recently lost not one but two spokes from my bike, which didn't make for a very nice ride. I'm now contemplating replacing it with a new one. They've got some great ones on offer at the nearby shop. I'm not sure how much longer this bike will last anyway, I've used it everyday for the past few years now. On the other hand, if I have the wheel replaced it might be fine for a few years to come. Hm. Dilemma.
Update: I decided to have the wheel replaced and it's now all shiny and silvery again. Well, at least the back end. The rest is still rusty. I've promised myself I'll get a new one if any new faults show up.