You need PackageFactory for U3, is freeware, you can download it from here:
Then, download the app from PortableApps, install it anywhere of you computer and enter in this folder.
Open PackageFactory, and drop the aplication's archives (the exe, all the archives and the folders) in the first square, then click create and the file will be created.
Sorry about the bad English, see ya.
ClamWin Portable
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http://www.mediafire.com/?cozcktzy5nh
Gimp Portable
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http://www.mediafire.com/?0ydzyfyodka
VLC Portable
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http://www.mediafire.com/?6mng2jzmn2t
Ok ... you can make U3 app like that, but than you have to use initial \profile also you can not make any changes (when you add some bookmark for exp, it will disapier in next Firefox start). This is my expirience, so if you have any solution for this pelase let us know.
br
Zlatan
install protable apps inside of u3?!?
Zoop