I've supported a redundant, depressed DH, and it's hard.
I went to counselling on my own to help me to cope with the situation. Best advice was to support him by detaching a bit and not to try to 'fix' everything for him. Hardest part was doing just that - I could see so clearly what I thought he should be doing but wasn't. Truth is, he has to work it out for himself.
Being supportive doesn't mean sorting his life out for him, it means accepting his choices about what to do, even when you don't agree with them (assuming he's not putting himself or anyone else in danger. Had to deal with that too, but that's another story).
Try to keep life running normally and try to keep him involved.
If he has any good friends, encourage them to spend time with him.
If you think he may be depressed, persuade him to see his GP - it's not your job to diagnose him!
Make sure you have people to support you in RL, as you need somewhere to vent. MN is wonderful but RL is even better.