When you look at the History of Delphi (software) – Wikipedia, the real innovation – including Borland Kylix – was during the Early Borland Years fading later with three temporary surges, the first being the Delphi .NET support introduced in Delphi 7 and Delphi 8 happening too late during the Later Borland Years, then during the Embarcadero Years support for Unicode and Generics both in Delphi 2009 and followed by a the struggle of their cross platform compilers and (externally bought) FireMonkey vector-based GUI support independent from the Windows API in the XE series of Delphi versions. The Idera Years did not bring any real innovation: just minor updates presented as major ones.
This went hand-in hand with their then flagship relational database InterBase dwindling down after first open sourcing InterBase version 6 in 2000, then closed sourcing it again (sparking the Firebird database development ) with latest versions were years apart: 2020, 2017 and XE7.
This more or less stalled innovation means that older Delphi manuals and books stay relevant despite their physical copies having been long out of print, and made their way as PDF files on the internet.
So, for my link archive:
The Wiert Corner - irregular stream of stuff 