Bitcoin usage charts There is a lot of data out there about BTC prices, but are there any simple charts which show how much is Bitcoin really used? Something like number of Bitcoin transactions per day/week, or daily amount of bitcoins transferred, from the beginning to present?

The data should be available in blockchain, but did anyone make pretty charts?
Blockchain.info is an alternative to blockexplorer that has additional statistics regarding market prices, mining costs and bitcoins in general. There is some information there about transactions that might interest you.

Here is a chart with data from last year:





A chart with Bitcoin Days Destroyed is also available at the website. This might be a better way to represent Bitcoin's usage. See this question and the wiki for more information about Bitcoin Days Destroyed.