Black Ops Zombies

Does any here play Black ops Zombie? I love a good zombie session on Black ops. The highest wave I have made it to is level 24. Has anyone else managed to get higher?

Whats your favourite map?

Do you have any hints or tips to help others out?

I think the highest I got to was 28 on Kin den Totten (or whatever it is)

I kept running out of ammo so it got ridiculously hard haha

I think I got to wave 26 maybe 28 on Five. It was a tirelessly long match where everyone else kept going down and I had to revive them, but oh well.

I love Black ops Zombies, I spend hours playing it.