Drupal and scalability in the same sentence! Drupal 5.0 was a nightmare, my personal server could barely handle one user, all the modules needed created an incredible amount of mysql queries for every single page.
And when you read about huge sites using Drupal, they always rewrite big parts of it to make it perform much better, wonder why they chose Drupal.
Drupal has established itself in the field on sites with over a million pages, and at more than 20,000 requests per second. Its core setting up handles over 99% of use cases, while free optimization tools and an extensive base of Drupal trained administrators address the other 1%.
As to whether it's scalable or not, I'm going to go with a big fat YES
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