a help insight tooltip window pops-up when moving the mouse in the code editor over a symbol. it produces a tooltip window with information about the specific symbol inside, including relevant links to additional information from the on-line help.
you can also get the help insight window in combination with a code insight window, in which case the help insight gives more information about the currently selected code insight item. this can be very helpful if you need to select a property, method or event but need to know which one should be selected for a specific purpose you have in mind.

delphi 2005 help insight on code insight
help insights are also generated from your own classes and methods as well.
structure view
the upper left corner of the delphi 2005 ide contains the structure view. this window is used in different situations. it can show the hierarchy of source code in the code editor, html controls in the html designer, as well as the hierarchy of visual controls in the vcl forms designer. for a source code structure, the structure view will also dynamically display syntax errors in the top node called 'errors', which lists all errors found by error insight.

delphi 2005 structure view
when viewing the structure of visual components, you can double-click on items in the structure view to be taken to the specific component in the forms designer. when viewing the structure of source code of html, you can double-click on items in the structure view to be taken to the corresponding declaration in the code editor.
search results
when performing searches, the results are now displayed in a convenient treeview, with the hits grouped by filename. you can browse through the files, and open the nodes to view the individual hits inside the specific file.