Well, I'm a little bit late closing this out. I ended up extremely busy this past weekend, and spent a new record minimum amount of time on my OGF hobby - less than an hour.
Let's hear the results!
I know BMSOUZA kept a record of his challenge progress here - a very inspiring idea:
Seeing his idea, I "blikied" my work on the challenge here:
I achieved the advanced challenge, I think, with only two "highway" tags the whole month, and both were "highway=pedestrian" so I don't feel too guilty.
Everyone else, post your results, thoughts, achievements, etc., in comments.
Coming soon: May challenge!