I seen @btcprice, but wanted something cleaner, only the latest price and nothing more.
Appart from that, I wanted a reliable bot, not one that depends on a site that fetches the price from who knows where, then dlvr.it gets the data from a feed and finally publishes to Twitter. My bot gets Mt.Gox data published directly to Twitter and doesn't deppend on any other third party service that adds unreliability and slowness.
@bitcoinprice doesn't look bad, but only one price each hour it's slow for me.