Here is a page from Symmetry math journal @ Runde's Room. This is a joy to read. The teacher has taken such pride in creating a journal entry that is clean and structured. It allows comparisons both vertically and horizontally.
The Teacher Who Hated Math: Math Notebook LOTS of great stuff here. Have to spend more time looking later. I LOVE how she set up her math notebook. I was looking for a better way next year. I had some of the same problems being table of contents
Love using math journals with my students! This page has tons of great ideas to assist in journaling. Whether you call them math notebooks or math journals, writing about math and documenting math activities are a great way to cement mathematical.