Is there a good newsletter for summaries of the bigger technology upgrades to the Ethereum ecosystem? I can’t really keep up with the play-by-play. I’d like a monthly top-5 links. 

Right now I mostly just find out about things via random casts and back channel chatter. Like I just learned about based rollups.

Christine Kim's pretty meticulous about this:

Blogger at ribbonfarm.com, running summerofprotocols.com, host of /gloom ☀️

Christine Kim's pretty meticulous about this:
https://open.spotify.com/show/6oOvHYuJKfzs8fkHaeDL5D?si=875daf3e24f54724
https://www.galaxy.com/insights/research/ethereum-all-core-developers-consensus-call-136/