Exporting with libraries.

[Rewo]

I'll try it in my free time.

EDIT:

It's very interesting, size of files is about 33%-40% ratio. We will see after packing into *.rar.

EDIT2:

So.

Without using UPX:

libgcc_s_dw2-1.dll + mingwm10.dll + QtCore4.dll + QtGui4.dll + mobile.exe -> packed into rar : 3983 KB
libgcc_s_dw2-1.dll + mingwm10.dll + QtCore4.dll + QtGui4.dll + mobile.exe -> unpacked : 11840 KB
RAM usage : 7500 KB

With use of UPX:

libgcc_s_dw2-1.dll + mingwm10.dll + QtCore4.dll + QtGui4.dll + mobile.exe -> packed into rar : 3969 KB
libgcc_s_dw2-1.dll + mingwm10.dll + QtCore4.dll + QtGui4.dll + mobile.exe -> unpacked : 4644 KB
RAM usage : 16652 KB

It's very useful.

[Talei]

Also using UPX serves as "protection" against debuggers. I remember, back in my school days, when I came across UPX'ed exe (wanted to change some values in exe)... it was a long way to figure out what was what, for the person with very little programming exp. at that time. Said that, the person who will want to crack Your code will do that, I mean... they crack Themida so....
Right now I think UPX is one of this tool that You "must to have", and not only for the Qt.