I use open office for my minute by minute readings of energy use and google docs for my daily and monthly. When I take the time to get the programming done to automatically fill the spreadsheet I'll be using google docs for everything.
It has a graph that will spread thigns out by date and lots of cool zooming options.
here is my over a month behind filling it out (hence the automation programming needed) hotwater usage spreadsheet as an example.
https://spreadsheets.google.com/ccc?...thkey=CKSwgdgK
Also here's my whole house electric usage broken down with a bunch of info I work out
https://spreadsheets.google.com/ccc?...thkey=CJC147YI
I'm very happy with google docs. I'm at work at the moment but 100% of my data is there easy to access and trivial to share.