If you are lucky enough to have a USB 2.0 device (they are few and far between)
and feel brave, then you can enable the ehci driver in -current.  I'm very interested
in any results you want to share.
The ehci driver is far from complete, but it sorta works with some mass storage
devices (like my CD-RW).  The most glaring lack is supports for USB 2.0 hubs
(which I've not been able to find yet).

Oh, and in case you don't know, USB 2.0 is a big speed improvement, 480Mb/s
instead of 12Mb/s; connecting disks and network adapters is no longer a joke.

    -- Lennart