In this posting I list a few things I really like about Eclipse. Most of these things (but not all) are currently not (or only very limited) supported by Qt Creator (1.2). I'd really like to see these features in Qt Creator, because I use almost all of them all the time when I write Java Code (only the last two I use less often). Note that NetBeans also supports these features in some way. There are differences between Eclipse and NetBeans that make me use either IDE for certain projects, but none of them concern the basic features I describe here.
All the Sub-Windows
I have a widescreen monitor and I really like how I can move and place all parts/tabs of eclipse to my liking so I fill the screen neatly. I also like how you can trace errors in the project tree. Also note the red mark beside the scrollbar. This marks the line containing the error. You can jump to the corresponding line by clicking the mark. Other marks supported by Eclipse are warnings and TODOs (in comments).

Highlight Symbols
When you place the cursor into a symbol all occurrences of it get highlighted. See also the gray markings beside the scroll bar.

Auto Completion
Camel Case Wildcards
(I think this is already supported by Qt Creator.) You can abbreviate names by only typing the uppercase letters (and the initial lowercase letter for members) to speed up autocompletion.

Overloaded Methods
Overloaded methods are listed like any other. In Qt Creator some kind of strange tool tip gets displayed (only method signature, no documentation). I think this is confusing. I don't expect a tool tip to capture my up/down key strokes. Also you have to go through all in order to look if there is a signature that fits your needs. The way Eclipse does it you see all (or as much as possible) signatures at once.
Granted, the way Eclipse does it pollutes the drop down menu. I think it depends on the preference of the programmer. This should be an option.

Advanced Tool Tips
Eclipse displays tool tips for classes, methods, fields etc. on mouse hover.

There are a lot of nice things about the tool tips in Eclipse. When you click them they get a bar with which you can resize and move them.


You can also navigate the documentation displayed in a tool tip.


Class Creation
Eclipse provides a neat class creation dialog. You can fill in generic types, enter the package name etc.


Auto Correction
For a lot of common errors Eclipse provides auto correction when you click the red x icon beside the line number. This comes really handy from time to time.


Code Generation
Eclipse provides means to generate common and simple code. This code is trivial and just cumbersome to write.


Refactoring Preview
Before you apply any refectoring step you can preview it in a nice diff view.

Visual Type Hierarchy
I think the images speak for them self.


Visual Call Hierarchy

Find References of Classes
