I feel so bad; I'm going to ditch not one but two great ATIP shops for better jobs this month! And they both need good people for entry level positions!
I personally think this sort of work is ideal for people who've worked at call centres, partly because I used to be one, but also because the sort of data management you did there will lend itself well here, you don't get abused by clients, you make a LOT more money, and you're (usually) smart and fast enough to do the work. Not to mention you'll never work another holiday as long as you live. Students very welcome!
Now: how to get these jobs?
1.) You can offer to do casual (maxiumum 90 working days per calendar year, basically 4 months per department, and you can hop around when you're done your term), which just requires contacting the department you'd like to work for and giving them a resume and some references.
2.)You can also go through a temp agency (personally, I like Excel, 'cause they pay me a decent amount, but The Associates Group specializes in ATIP; they pay $16/hr for an AS-01 position, though, and you'd get at least $20/hr for that position if you worked casual), and tell them you're interested in doing ATIP. They can often be useful in matching employees to jobs, and you don't have the 4-month limit if you go through an agency. They'll want a resume and references, too.
3.)Term and permanent positions have to be earned through competitions open to the public. They can be found here. You can even set up an automatic alert that will send any relevant opportunities to you via email.
ATIP needs good people...they need YOU!