The new Delphi 2010 and C++Builder 2010 bring a ton of new features in all areas including IDE, Compiler, RTL, VCL, Database and DataSnap. It is probably the easiest to enumerate countless new IDE usability features like IDE Insight, source code formatter, thread debugging, debug visualizers, new Open Tools API and others.
These are little productivity improvements that Delphi and C++Builder developer will enjoy in every day coding and using the product. There are some really nice Object Inspector improvements discussed in blog post like checkboxes for boolean properties, date picker for datetime properties, improvements in "Action" property editor.
I like the new area at the bottom of the Object Inspector. This is new "verbs" area where you can access property editors of a selected component.
If you right-click on a component on a form, the first part of the context menu contains all registered component editors. In the case of the TListView component there are three component editors: "Columns Editor", "Items Editor" and introduced in Delphi 2009 "Groups Editor".
Now these component editors are also available from the "verbs" area at the bottom of the Object Inspector. This is similar to what we had in the past in the Delphi for .NET IDE personality. We can also see the name of the currently selected property.