“I don’t know what bevel has to do with this”
I mentioned it because it creates triangles in 2.49..
Triangles are not the biggest problem in the world but it’s inconvenient having to think about them. And it’s not nice that you get a messed up mesh with triangles just because you used a tool like I mentioned, you actually have to remove them to fix the topology which is both destructive and add more work then if there just were n-gons. With a n-gon you could just fix the topology of that n-gon with the knife-tool or the connect tool.
I for one really look forward to bmesh.