Migrating virtualenv and Github between computers
In addition to scripting creating a new virtualenv, you should make a requirements.txt file that has all of your dependencies (e.g Django1.3), you can then run pip install -r requirements.txt and this will install all of your dependencies for you.
You can even have pip create this for you by doing pip freeze > stable-req.txt which will print out you dependencies as there are in your current virtualenv. You can then keep the requirements.txt under version control.
I primarily work these days with Python 2.7 and Django 1.3.3 (hosted on Heroku) and I have multiple projects that I maintain.  I've been working on a Desktop with Ubuntu running inside of a VirtualBox, but recently had to take a trip and wanted to get everything loaded up on my notebook.  But, what I quickly discovered was that virtualenv + Github is really easy for creating projects, but I struggled to try and get them moved over to my notebook.  The approach that I sort of came up with was to create new virtualenv and then clone the code from github.  But, I couldn't do it in the folder that I really wanted because it would say the folder is not empty.  So, I would clone it to a tmp folder than them cut/paste the everthing into where I really wanted it.  Not TERRIBLE, but I just feel like I'm missing something here and that it should be easier.  Maybe clone first, then mkvirtualenv?  
It's not a crushing problem, but I'm thinking about making some more changes (like getting ride of the VirtualBox and just going with a Dual boot system) and it would be great if I could make it a bit smoother.  :)
Finally, I found and read a few posts about moving git repos between computers, but I didn't see any dealing with Virtualenv (maybe I just missed it).  
EDIT:  Just to be clear and avoid confusion, I'm not try to "move" the virtualenv.  I'm just talking about best way to create a new one.  Install the packages, and then clone the repo from github.