I had a Toshiba NB305, which apparently had an Atom N450 (just looking at some old reviews, I don’t have it running anymore). It seemed fine for basic command line stuff and some web browsing (websites already had too much JavaScript at the time but at least you could usually get away with turning it off without losing any essential functionality).

It was by far my favorite laptop I’ve ever had. I put an SSD in it, though, which made a pretty huge difference.