I have created a portable emacs distribution for Emacs 23.1 (EmacsPortable 23.1.0.12). I have described it at:
http://esnm.sourceforge.net/EmacsPortable.html
It assumes your Documents under your USB drive is your home-path. It can be installed locally to speed up the Execution. Afterward, EmacsPortable launches the local installation if present. If run locally with the USB drive in, it will use the emacs customizations from the USB drive. Otherwise it will use the customizations in the windows home directory.
It allows custom installations to minimize file size. It also allows installing tools that emacs finds useful (like a spell-checker). All of it is optional. Additionally, it optionally allows compression of elisp and compiled elisp files to reduce file size.
The download (not yet linked at the description page) is found at
https://sourceforge.net/projects/esnm/files/EmacsPortable/23.1.0.12/Inst...
[I turned your homepage link into a link by inserting http:// before it... even though I'm a Vim man myself 
- mod Chris]
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If you ever want to convert, EmacsPortable supports VIM keybindings. :). I have heard that if I ever want to convert, VIM supports emacs keybindings too.
...its not so much a matter of "converting", from what I hear. emacs, is elisp (which is like lisp), with a bunch of shortcuts thrown in on top.
Keybindings are keybindings, emacs has a Viper mode for users who like emacs better, but who like vim keybindings better.
(There might be a way to run elisp inside vim, if there is, I don't know about it, but it would make sense for there to be.)
I just thought I'd throw that in there, just so no one is confused and thinks that its an either-or, religious conversion thing.
You might decide first whether you want an easy, portable, but powerful text-editor (vim), or a powerful (but slightly bloated) elisp interpreter with a set of editors thrown on top first. Just my two cents (emacs user personally, though I can see the utility of vim's ergonomics).