There are places where I don't want to broadcast a "steal-me". I really couldn't care about the actual hardware being stolen, but if I sit (or stand) somewhere other than at my workplace or at home, it usually means I have a deadline, and I don't want to miss that deadline, not to mention my audio (unlike writing, I can't really recreate stuff like that very often).
I sometimes tape the logo off, so it won't be a beacon in the dark under those circumstances and if I really HAVE to sit somewhere were people can see me (or lift it up/halfway out the window at night to get a connection and that sort of thing).
But, anyway, this is one of the reasons I might be going for Nagra LB (it's a recorder) as it will make it possible most of the times to forego bringing the computer at all (it can do basic editing), and "merely" carry: A "normal" phone (old Nokia), a smartphone (i780), a PDA, BT keyboard, audio recorder, zeppeliner and microphones, headphones and all the rest of the crap one has to drag along to be set-up properly and nicely.
So, in short: I try to avoid bringing it as a whole, depending on circumstances, and certainly there are places I won't be using it, even though I brought it along. I'd rather be a little delayed than not being able to work at all.