MCampagnini updated his ASE script to support vertex painting which can be used to paint colors directly on the mesh. These colors will be used by the UT 3/UDK editor to apply materials to. The result is similar to painting terrain. This is usually used for rocks, terrain, and caves.
MCampagnini has update his ASE exporter to version 1.3.0. It is should be fully compatible with Blender 2.59. I have update my Blender to Unreal exporting page to reflect any changes. You can watch video as well on his website.
I have used it with some of my existing models and have had solid results with it.
Blender Cookie has 2 tutorials that can be very useful for UT 3/UDK mappers. They cover many techniques including baking high poly meshes to low poly meshes, creating diffuse textures in Blender as well as others.
I have followed and replicate the Sci0Fi pan tutorial with good results.
Achernar took the time to convert many of the Nobiax meshes into the .ASE file format, which is useful to us UT 3 mappers. He added light map support as well as collision models.
You will still need to download/have the texture files which can be found on Nobiax’s Deviant Art page.
Part 1 covers creating the model in blender, then creating a UV map.
Part 2 covers taking the UV texture that was created in part 1 and importing it into Photoshop. Once there, sample textures are used to create the diffuse/specular/bump maps. The tutorial also shows how to continue creating the texture while in Blender. It also covers creating materials that can be used only in Blender and how to setup the model to render.
I like the second tutorial as it was interesting how to create a texture from source photos and how you can alter your texture in Blender as well.
This is a great tutorial for those who are still learning the basics of Blender and those who want to get a better idea of the workflow.
Stevelois has gathered his knowledge on optimizing a level and created a tutorial. If you need some extra help in optimizing your level, have a read.