I don't see a bubble per-say (sic).
By international standards Toronto's real estate prices are very cheap. (As long as interest rates don't spike by 5%).
You may see a levelling off, but only for a moment. This city is growing in leaps and bounds. The population is expected to double I believe in the next 25 years. When I moved to Toronto 8 or so years ago, the population was just over 2 million. Now, 2.5 or even 2.6. Last year, Toronto grew by 100,000.
The condo market however is a bit of a different animal. I would not be so keen to buy a condo, instead try to find an "up and coming neighbourhood" like leslieville, parkdale, Toronto West Junction, etc. Face it, single family homes and semis are always in demand and there will never be a glut on the market like the condo market. Monster homes being the exception to that rule.
The other thing to think about (believe it or not) is Hamilton. Real estate prices in the Hammer are very cheap compared to Toronto. Prices there have only moderately increased in the last 6 or 7 years while Toronto has doubled in some select neighbourhoods. There was an article in the Globe and Mail about Hamilton Real Estate and it was very positive on not just the prices, but the outlook.
Here's a link to an article in MacLeans.....
http://www.macleans.ca/topstories/business/article.jsp?content=20040510_80137_80137