TI has several practices within it:
1. Networking
2. Business Intelligence
3. Information Dynamics (Databases, Datawarehousing)
and so on.
Go here to get the exact names and descriptions:
http://www.deloitte.com/dtt/section_node/0,1042,sid%253D26551,00.html You won't know in advance what you're going to work on. Everything is on a project basis. And that means, you'll often have to learn new technologies and hit the ground running. That's one reason Deloitte doesn't ask technical questions for entry level positions - simply because they don't know yet where you're going to be placed and what project you're going to work on.
My personal experience with Deloitte USA is that its a fantastic company to work for - if you enjoy working hard and partying hard, if you are outgoing and ofcourse, have a great attitude. The employees are young, very smart and very dynamic.
Hope that helps,
Amit