I'm starting to really love Drupal. There is so much that is easy, and virtually nothing that is impossible. Building a site in Drupal gives me a lot of power I would have to work very hard to duplicate in a non-Drupal site.
Sakai has some interesting tools that WebCT lacks, however, the list of WebCT features that Sakai lacks is far longer, and arguably, more significant to educators. It is particularly vexing that Sakai has poor search capability, no tracking capability, and an inadequate gradebook. For a more complete comparison of the two, you can visit my gap analysis at http://www.udel.edu/present/Becky/gapAnalysis/.
Since I work at the University of Delaware, and since the decision has been made to migrate UD's website into Drupal, it only makes sense to explore how many of these gaps can be plugged using Drupal. The good news: Drupal is an extremely flexible and powerful tool, which in theory can do almost anything. The bad news: the UD production server is very tightly controlled, and it is impossible to really explore all that Drupal brings to the table within a UD production server instance. The other bad news is that Drupal is neither easy nor intuitive. Webmasters who request a Drupal site thinking that the power of a database-driven website will simplify their lives will be badly disappointed!