We conducted this study to find out if online learning packages in cardiology enabled users to increase their knowledge and skills. We also looked at how acceptable users found these packages. The journal Heart in association with BMJ Learning produced a series of modules on common cardiology problems. The modules involved a pre-test, a number of interactive cases and a post-test. A total of 1786 users completed these modules. Doing the modules enabled users to improve their score from the pre-test to the post-test by a significant amount (p<0.001). Feedback to the modules was very positive.