> But my box can't USB-boot.
Thats very hard... But u got a floppy, or?
U Could install Grub onto a floppy ant tell it to "boot" via USB...
> So if I buy a 'DVD player with USB & CD ripping'
> [as the Philips 3360 blurb describes], will lenny find
> this and continue to complete the installation ?
Sorry Dude.. I think u didn't read the description properly

It can rip
AUDIO-CDs or -DVDs to .mp3 and store them onto an USB-Stick. Probably it
won't read the Lenny-CD
Try the thing with the Floppy [if u CAN] or install a CD- or DVD-Drive
for this installation.