Prices on Bitcoin Classifieds are always shown in Bitcoins. A feature that has been requested a lot is the ability to set the price of your advertised product or service in Euro or USD, and to have the correct Bitcoin value displayed automatically on your ad.
From now on it is possible to select a price for your ad in Euro or USD (and of course BTC), and the price in Bitcoin will be calculated and updated automatically when the Bitcoin value goes up or down. The Bitcoin price will be calculated according to the weighted average value of the last 24 hours (Source: Bitcoincharts.com)
Try it out on http://www.bitcoinclassifieds.net