I've loaded Magritte and Seaside from the configuration browser into Pharo 4, but I don't see that the package Magritte-Seaside was loaded.
How do I load this package?
I saw the group Seaside
defined as a Metacello group in the configuration's baseline for 3.3 (which is used by 3.5, the current version). So I was able to load the package by evaluating:
(ConfigurationOfMagritte3 project version: #stable) load: 'Seaside'.