Actually, you can use zoneedit.com's free
dynamic DNS service .... look at the Unix Clients for scripts to keep zoneedit updated.
All the free services (like geocities) will kick you off if they see you are rerouting the traffic...
There are domain names available for $4.95/year (for .us and .biz), and 7.95/year for .com addresses at
GoDaddy.com ... just setup a free account on zoneedit.com, add the domains to zoneedit.com, they tell you what name servers to use ... go back to the GoDaddy.com, buy the domains and point them to the zoneedit name servers ...