Question on list objects

Hi, I have 2 questions on list object:

1. Suppose I have a matrix like:
dat <- matrix(1:9,3)

Now I want to replicate this entire matrix 3 times and put entire result in a list object. Means, if "res" is the resulting list then I should have:

res[[1]]=dat, res[[2]]=dat, res[[3]]=dat

How can I do that in the easilest manner?

2. Suppose I have 2 list objects:
list1 <- list2 <- vector("list", length=2)
for(i in 1:2) {
??list1[[i]] <- matrix(rnorm(15), 3)
??list2[[i]] <- matrix(rnorm(15), 3)
?}

How can I add these 2 list objects? I have tried with just list1+list2, however it is generating some error.