As a follow-up to our September Canada Start-Up Index yesterday, we've arranged with comScore to get some real data behind what our numbers mean. While we agree that Alexa and Compete (and our Techvibes Traffic Rank) numbers are not an accurate measurement of website traffic, they are a great way to compare the traffic of multiple online properties as it creates a level playing field for metrics.

In the above chart, the Online % Reach is the percentage of Canadians online that each entity reaches. As an example, Metrolyrics.com reached 8.5% of all Canadians during July 2008, making them the hands-down leader. Side note - since last months comparison Nexopia has grown their lead on Plentyoffish increasing .4 while POF dropped .2.
Thanks to comScore for sharing this valuable data with Techvibes!
Where did our good friends b5media go?
@AhmedF - good question. Once we compile the Canada Start-up index, we submit the top 40+ websites to comScore and they come back with this snapshot. So, either b5media.com has dropped (highly unlikely) or they got omitted accidentally when this snapshot was generated (more likely). We'll know for sure with next month's update.
I think ComScore has its own accuracy issues. They use to have a problem with iframes and counting visits twice. It would appear from your list that it might still be an issue...