I got an additional letter for a graduate assistantship along with my acceptance. The assistantship covers 30 credit hours of tuition (basically the first year) along with a stipend. In return, I'd have to work about 12 hours a week for the department. I'm not exactly sure if it entails TAing or working in a lab, but I'm pretty excited about the opportunity either way. I never really expected any funding when I began this process.
Remmy, I just heard from Indiana on Friday. I was starting to feel like everyone had heard from IU but me as well. The letter was postmarked 2/29 and others began hearing from IU as early as 2/25 so I don't think all of the letters went out at the same time.