Been generally happy with ATT (SBC (PacBell)) DSL over the years. Price keeps going down, speed up as long as you ask to be on an updated promotion (which sometimes requires a 1-year contract, not a big concern for me).

Another option not yet mentioned: Astound cable (was RCN; see astound.net). I was happy with RCN (very fast problem-free service) for about 2 years, then moved to an area RCN didn't yet service. Might be worth a look for completeness.