Has anybody ever able to deploy qt application?

[squidge]

First of all, unless you have a commercial license, you can't statically link Qt applications.

Not exactly true. You can statically link Qt applications under the terms of t he GPL license if you don't have a commercial license. This does mean however that anyone can request a copy of the source code, and you must send it to them (or point them to where they can find it).

[Lawand]

General tips for generating Qt static dlls (tested using Qt SDK 2010.01 and 2009.05)
1. Use windows XP
2. Use "Qt Command Prompt" (found in start menu > programs) instead of the regular command prompt
3. Don't build phonon (unless the have installed the SDKs mentioned in Qt for Windows Requirements).

In other words, open up the "Qt Command Prompt" after a fresh Qt installation, then type in:

configure -static -release -no-phonon -platform win32-g++

Then:

mingw32-make

And now, when you build a Qt application, the only dlls required to be shipped are mingwm10.dll and possibly libgcc_s_dw2-1.dll (both found at <mingw-directory>\bin which would typically be C:\Qt\2010.01\mingw\bin). And the size of these two combined together is about 50kb...