Ours is very extensive and run on a point system that ends up determining the order of roll numbers when initiated.
First off, some basic rules - NO pledge can consume alcohol from noon Sunday to 5pm Thursday, unless there is permission given by the pledge educator - examples include homecoming week and on pledge class sneaks during pledge semester. Also pledges aren't allowed to go to certain parts of the house (chapter room and hallways leading to it). They also, out of respect to the actives, aren't supposed to say the words Kai and Wooglin. Those are the main rules in addition to normal university standards and expectations of full brothers.
Other parts of our pledge program:
12 documented study hours per week. The pledge class gets to choose how those are split up (time as a pledge class in the library, individual, time with pledge fathers, other) All pledges have to get a 2.5 GPA to initiate (just recently made a 2.6).
Weekly tests over songs and lore. Usually had 2 songs per week (be able to write out lyrics and then sing as a pledge class) and then a 15 question test over lore per week and a large final. If a certain number of the pledge class (for my pledge class it was 3 of 24)didn't pass the tests then everyone had an extra hour of studying in our dining room after our time in the library.
We were required to be a member of two campus organiztions.
Minimum of 18 community service hours in pledge semester.
Play in a minumum of 4 intramural games (not sports - so could fill the requirement with one sport in which you played 4 games).
Weekly meetings as a pledge class with the Pledge educator, as well as weekly meetings as a pledge class, all were mandatory unless circumstances were insurmountable.
Had to go to house events, such as theme parties, serenades, brotherhood events, as well as take turn being DD.
Individual Pledge project - something to benefit the house: Some painted murals, put up new mailbox, researched early history of the chapter and made a booklet about it, one of my pledge brothers is a really good guitarist so he recorded one of our songs with his guitar.
Pledge class also has to give a gift to the house. My class gave a DVD player for our third floor OA, new pool cues, new stereo reciever, new multidisc cd player, and a new tv stand. Previous class gave a DVD player for our main tv. (Demonstrates why my pledge class is considered the strongest in the house...

)
Pledges are supposed to interview as many actives as possible during the pledge semester.
Pledges are also in charge of daily clean up of the house with each pledge having a duty that takes at most 15 minutes a day. Duties were rotated regularly during the semester. Pledges are also supposed to answer the house phone, and are required to clean up the kitchen after formal dinner on Monday nights. As a service, and "payment" for older guys having parties at their apartments or duplexes, the pledges are to go over the day after the party in order to clean the place up.
Obviously required attendance for every ritual.
It's a good program that while taking a lot of time, really prepared everyone for success throughout the next four years.