Goksel-Eryigits-Mac-mini:blog geryit$ rake db:migrate --trace (in /Users/geryit/Sites/blog) ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** E
I was getting 'uninitialized constant Mysql' on Snow Leopard and Rails 3. Adding 'mysql' gem to Gemfile fixed it for me.