A algum tempo o Fernando Rizzato compilou uma lista de links bastante útil para quem utiliza RAD Studio, Delphi e C++, segue a lista:

Documentação do RAD Studio
http://docs.embarcadero.com/products/rad_studio

CodeRage (30+ webinars por edição)
CodeRage 8: http://www.embarcadero.com/br/coderage/embtc-gated-sessions1013
CodeRage 9: http://www.embarcadero.com/br/coderage/coderage-9-op-sessions
CodeRage X: http://www.embarcadero.com/br/coderage/coderage-x-op-sessions

Developer Skill Sprints (100+ webinars, 20 minutos cada)*
https://www.youtube.com/playlist?list=PLwUPJvR9mZHhZTajVWsgaFPLtDA-t1Xwc

FireDAC Skill Sprints (10+ webinars):
https://www.youtube.com/playlist?list=PLwUPJvR9mZHgjJ0JtSqJ-dv2cGtWr-jtq

RAD In Action (30+ workshops)
https://www.embarcadero.com/rad-in-action

Developers Direct (30+ webinars)
http://streaming.embarcadero.com/www/DevDirectWWW.dll/home

Migration Center
http://www.embarcadero.com/rad-in-action/migration-upgrade-center

Books, ebooks e Courseware
http://community.embarcadero.com/resources/books

Embarcadero Community
Home: http://community.embarcadero.com
Forums: http://community.embarcadero.com/forum
Answers: http://community.embarcadero.com/answers

Fontes de informação para desenvolvedores
FMX Express: http://www.fmxexpress.com
Delphi Crash Course – http://www.festra.com/eng/les01.htm
Delphi Basics – http://www.delphibasics.co.uk/index.html
Essential Pascal – http://www.marcocantu.com/epascal/default.htm
Essential Delphi – http://www.marcocantu.com/edelphi/default.htm
Essential SQL – http://www.marcocantu.com/edelphi/EssentialSQL_md6.pdf
Pascal Programming – http://pascal-programming.info/index.php
About Delphi – http://delphi.about.com/od/beginners
Learn OOP with Delphi – http://delphi.about.com/od/course/a/oop_intro.htm
Pascal Programming – http://en.wikibooks.org/wiki/Pascal_Programming
Start Programming Using Object Pascal – http://code-sd.com/startprog/StartProgUsingPascal.pdf
Delphi Programming – http://delphi.wikia.com/wiki/Main_Page
Delphi Central – http://www.delphi-central.com
The Index – http://www.tindex.net
Swiss Delphi Center – http://www.swissdelphicenter.ch/en/index.php
Dr. Bob’s Delphi Clinic – http://www.drbob42.com/delphi
EFG’s Computer Labs – http://www.efg2.com/Lab
Digital Signal Controllers in PASCAL – http://goo.gl/yyfqsX
Richey’s Delphi Box – http://www.inner-smile.com/delphi5.phtml
Delphi Training Series – http://www.youtube.com/playlist?list=PLCC32444ED145541B
All about Indy – http://www.atozed.com/Indy/index.EN.aspx
Stack Overflow – http://stackoverflow.com/questions/tagged/delphi

Resources em Português:
Delphi Academy Replay – http://embt.co/DelphiAcademyReplay
CodeRage Brasil X – https://www.youtube.com/playlist?list=PLwUPJvR9mZHhV5paPRZ_Qspw7gllng-5u
CodeRage Brasil III – https://www.youtube.com/playlist?list=PLwUPJvR9mZHg6F2HCRTpX8t4lJoeF24fJ
Embarcadero Conference 2015 Online – https://www.youtube.com/playlist?list=PLwUPJvR9mZHggrpN-do7HYdgFJc-7TRXW