If we are all about water and energy conservation, this is a good way to track your progress towards a goal - and it can also give you an idea if there is a mistake in calculating your bill - or the impact that out-of-town guests may have on your utility usage.
I took a look at my water usage and a record of the amount billed (that information is only available for the past year.) My results appear below:


The above is a bar graph showing the amount billed over the past year. You can see it's relatively consistent during 2008 - there was a spike in usage for some reason on the January '09 bill. The key thing to look at is that the "increased" rates went into effect effective with the April bill. If everything is correct, that means that I will be paying about $50 less per month for water over the average bill last year. I'll take a look at the ordinance that put the rate adjustment into effect, but low volume users may significantly benefit from the new rate structure. The more you use, the more you pay per 1000 of gallons.
By the way, an item regarding purchase of water from West Palm Beach is on Tuesday night's agenda - to the tune of about half a million dollars ($0.5 million.) The city will be getting the West Palm Beach water for about $2.50/1,000 and, according to my rate on this last bill for May, retails it to customers at $5 and change per 1000 gallons. This is making up for the shortage caused by the South Florida Water Management District restricting our draw from the aquifer (to prevent further salinization) and will supposedly carry us through to a time when we are getting water from our own reverse osmosis plant.
Let me know if you encounter any surprises if you end up checking this out yourself.