I just found by accident that Embarcadero has made most (all?) blog posts from Borland and Codegear available, back to 1995. They are by “Embarcadero Archives” and there are 474 posts in total. The very first one is Extracting A Bitmap From A BLOB Field from 1995-06-01.
There is also Allen Bauer’s A “Nullable” Post from 2008-09-18, wrongly attributed to Barry Kelly
Another possible gem is Change dproj file and product version from 2025-12-05. (I haven’t actually checked the code.)
Accessing that site is dreadfully slow though and there seems to be no search function available, so I made one:
(Sorry if this was already common knowledge. It was new to me.)