I have Vonage for 2+ years with the $14.95/mon for 500 minutes combined local and LD. Just looking at billing history:
Jun 15, 2004 $16.94
Jul 15, 2005 $16.94
Jun 15, 2006 $17.87
Dec 15, 2006 $18.77
Yeah it sucks a little but it's better than Verizon's cheapest plan.