We have put up a readable mirror of the bitcoin-dev archive, refreshed daily.
What it adds over public-inbox: one page per thread with quotes folded, stable permalinks by Message-ID, and three indexes over the same data: topic timelines, a page per BIP discussed, a page per author. Messages are verbatim; the only words of ours are the topic blurbs. Every message links to its original.
Two things we would like to get right and could use your eyes on. First, name merging: spellings one address used are folded into one page (“Luke-Jr” and “Luke Dashjr”), never through list or group addresses; if a merge is wrong or you would rather not have a page, say so and it is done. Second, threading: References first, a subject match within 180 days for the few hundred replies that lack them; mis-threaded threads are easy to fix if you point at one.
If it is useful, we would be glad to be listed among the public archives of the list. If any of it is unwelcome, say that too.