Productivity tricks that still seem to work for me after several months of use:

• Autofocous TODO lists on a paper notebook. There's a single notebook page with 20-30 TODO items, and that'll be the only TODO list I pick tasks from until all the items are done, abandoned or migrated to a new page.
• Pomodoro-style timeboxed work sessions listening to a noise track. Trying out this one linked on Cal Newport's blog now.

I also recently found out about Bullet Journal notation for notebooks and started using that alongside the autofocus. Basically you collect everything chronologically in a single notebook and build a table of contents and add special topic pages as needed. I'm using the monthly calendar pages idea from Bullet Journal to have a page where I have a single-line description of what I did on the day for each day of the month.

EDIT: The notes the noise track plays every 10 minutes started to grate after many repeats. Switched to this one