I've been working on online tools for consensus for the last 2 years. Here's what motivates me to work on this.
1. The water heater
For my first five years in Boston, I lived in a housing co-op in Dorchester. It's a classic Boston triple-decker, which the 13 residents own collectively. That means that we didn't have a landlord, but we were in charge of the mortgage, maintenance, utilities, and everything else. The house operated by consensus, and all decisions happened at weekly house meetings.
At one point, one of the three water heaters that serviced the house died, which left our main kitchen without any hot water. One of the residents (a well meaning, competent, and all around good person) took on the task of fixing this, and called up a plumber for an emergency job. The plumber charged us the emergency rate; almost $2000 to install a new water heater, very similar to this model here, which rings in at $358 at Home Depot: