RoadRunner (According to Time-Warner Services, RR's parent company) Uses 
DHCP almost exclusively.

You *CAN* request for static IP addresses, but only a few select providers 
allow that.  @Home, on the other hand, provides static IP Addresses.  Users 
can have up to 5 static IP Addresses with @Home.

Just from a cable modem user who's been doing research since my hometown's 
getting RoadRunner in the near future...

Joe Brouhard
jbrouhard@home.com