Here's another one for UE3: http://stephenjameson.com/tutorials/lightmap-uvs-tutorial/ 32 x 32 pixels can be fine depending on the size of your object and the amount of instances there are and how detailed the shadow information needs to be. Light maps do add up after a while even at such small resolutions.
It's common knowledge that college only teaches you 10% of what you need to know in a professional setting. For my college experience, lightmapping fell into that 90% that wasn't discussed. Unfortunately, it's also a topic that was cited as a weakness of mine when I had my portfolio reviewed at GDC. So I'm wondering if…