Just for anyone interested in getting their DC online for the various homebrew serveravailable, i emailed Sega and they sent me a free DreamKey CD within two days, i'm posting this via my Dreamcast, the resolution is awful and this browser sucks, but strangely the it's faster than my PC, which is odd? :P
If you want a Dreamkey go to Sega.co.uk, and use the contact link.