Oh I already do utilize my Flash Drives to create Free Space on my Hard Drive.
For example, I use Portable versions of: CCleaner, FastStone Image Viewer, IZArc, Audacity Recorder and Revo Uninstaller. I also have FirefoxPortable ... not that I ever really use it. I really only use that FirefoxPortable when I have to test whether a certain problem is Opera-related ... or for testing Blog Design issues. I also have GIMP Portable, but there again, I never use it. I use Photoshop. So yeah, I save some space with those Portable Apps.
I tried the SAS Portable version once, but had problems getting it to run.
And also, if I understand correctly, with that Portable version, you don't really check for and download Updates. Apparently the download of the Portable SAS already has the latest Updates. Well, Sheesh! That would only serve for 1 day. Then you'd have to download an ENTIRE NEW batch of SAS Portable.
And IF space ever really got tight, I COULD operate with my Photos only on my Flash Drives instead of having them also on my Hard Drive.