Similar to the Delphi FOSS component question, a commercial component directory will also be a valuable searchable resource. I invite you to contribute your expierience with your favourite commercial components and also share with us your experiences with commercial components that doesn't make the grade as well. Then there is the question of price/performance or better price/features. Often commercial component pricing is sky high - indicate where you think it is good value or expensive.
If you can, please distinguish Delphi Win32 vs Delphi.NET components - and mention those that have support for D2009
Please don't forget your links!