When I was at Delphi Live in San Jose, I attended Marco Cantù and Cary Jensen Masterclass about Delphi Multithreading.\ Although, I'm expert of multi threading techiques and the related problems, this masterclass was very interesting and well organized as well.
IMHO, the topics have been presented in very effective manner and, as usual, in a very professional way.
After their speech, Marco introduced me to "Delphi Developer Days".
I'll do my best to attend their event in London.
Following some references in case you want also attend:
Delphi Developer Days 2009 London\ Top Delphi experts Marco Cantù and Cary Jensen are bringing\ their two-day live seminar to London on July 1-2, 2009.\ For complete, details, visit http://www.DelphiDeveloperDays.com