QUOTE (Caboose @ Jul 28 2009, 06:27 AM)

There's no point in putting it on an external HDD, as the transfer speeds are so much slower unless you use eSATA. As for running it from a memory stick, i don't know many that do that. Mainly because a lot of motherboards don't even support it. But no others have the OS, downloads and all of your files on the memory stick.
I kept it on an external for a while because my internal hd was broken; yeah, it's not the best option, but it's liveable.
Most newer motherboards support booting from usb; the last two laptops I've had supported it, although my parent's 5/6 year old desktop doesn't.
DSL has the advantage of being able to fit on a lot of smaller (read: cheaper) devices, seeing as Ubuntu takes up several gigs when installed; it also can be run from within Windows, which is pretty cool.
No, not a huge number of people run linux off a thumb drive; however, it's possible, and is one of the arguments for linux>windows, as windows can't be installed on a portable device without some serious jury-rigging.
And I'm not sure what you're saying with DSL being the only one to have "the OS, downloads and all of your files on the memory stick." If you install Ubuntu to a thumb drive, it'll keep all it's files there too.
EDIT: typos, it's 9 AM here and I'm a bit groggy.