I'am using Phonerlite as portable apps.
I've no idea if it is realy portable, but with me it is working fine.
http://www.phonerlite.de/index_en.htm
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It seems to save a majority of its settings in the application directory in an INI file. Note that I haven't checked the registry. As long as you get the zip package, you should be good.
Rob Loach [Website] [Projects] [Blog]