Like reflex said above, your best bet is another Mini 9, or a RunCore USB enclosure, if you want a small & fast external drive.
You might be able to use it in a EeePC 9xx series, but I believe the Mini 9 SSDs are smaller in height (50mm vs 80mm).
Sold my Mini 9 for a larger netbook, one that's easier on my wrists and hands.
Current Machine: 2010 MacBook Pro 13", 2.4 GHz C2D, 4GB RAM, Win7 Pro x64/OS X 10.6.3
And I play with my girlfriend's Mini 10v ^_^. Interested in using MATLAB on the Mini 10v? Check out my benchmarks!