As a developer who works here in Brazil with the medium income and low income markets I can say that yes it is still booming and will keep booming for many more years as the demand is being fuelled by locals who are buying homes to live in, not foreign speculators looking to resell to other foreign speculators.
Currently we are nowhere near being able to meet the demand of the local market - our current developments are (not counting the ones we have already delivered):
City Centre, Medium Income Tower blocks
42 apartments - sold out in 2 months (Nov 2009 to Jan 2010)
86 apartments - pre-launch two weeks ago, 38% reserved
Social Housing, Low Income - Government sponsored
1.534 houses with a church, shopping centre, supermarket, police station, medical centre, school, childrens playground, leisure areas, etc
Being launched in June 2010 and from the market analysis talking to officials responsible for the reservations, etc we have been told we need at least another 2.000 units to meet current demand.
Personally I'd say that was a pretty strong market to be in. Especially when considering that it is being driven by people who are buying it for themselves, not as holiday homes or to sell on to other speculators.