I started getting the package this year as well. I also recieved an e-mail that I should attend the benefits class (it's held once every month). The e-mail stated I had just become eligible!
Well, we do not get any medical/pension/etc... but I vaugly remember there is something that we can invest in. I'm sorry I don't have details, like the rest of you I just put it on my shelf. I should know in two weeks if I'm full-time so I'll pull it down then and let you know if I do find anything for interns!!