As someone who has been actively involved in real estate for the past 15 years, I can tell you from experience there are pros and cons to 100% financing.
First of all, yes, it is available. But you need to be wary of a decline in prices after you buy. Many times, the homeowner finds themselves upside down: owing more than the house is worth. And people always say, "Oh, hell, prices are rising. We've got nothing to worry about". Well, history, and recent history at that, will show you the errors of your thinking. Markets rise and fall all the time. And recently we are beginning to see an increase in foreclosures as these 100% loans, and adjustable rate loans begin to bite back.
Bottom line: do your research, and have a Plan B for when the unexpected happens.