We describe how tightly confining magnetic waveguides for atoms can be crea
ted with microfabricated or nanofabricated wires. Rubidium atoms guided in
the devices we have fabricated would have a transverse mode energy spacing
of 50 mu K. We discuss the creation of a single-mode waveguide for atom int
erferometry whose depth is comparable to magneto-optical trap (MOT) tempera
tures. We also discuss the application of microfabricated waveguides to low
-dimensional systems of quantum degenerate gases, and show that confinement
can be strong enough to observe fermionization in a strongly interacting b
osonic ensemble.