“Archeogeek” is making a new version of Portable GIS available, including QGIS 2. However this should be considered as a beta release, since soon an upgrade of PostGIS and GDAL is planned. Additional upgrades in this version: Astun Technology’s Loader has been upgraded to the latest version, and Psycopg2 is now included.
Please take time to read the main Portable GIS page. Please report any problems that you find at the portable GIS google group, or via Twitter (including a screenshot of the error, and the exact version of Windows that you’re using).
You can pick up the beta version here. This is a dropbox link, so if it’s not available, then the bandwidth was exceeded for the moment; please try again later.