Ripple != XRP. You can not buy "Ripple", it is a protocol.
30 day volume is at about 8k BTC towards XRP, about 500 BTC towards USD, total volume (in other currencies, USDXRP for example is also quite strong with 660k USD traded in the last 30 days) should be around what BTC-e does in Euros, looking at
http://bitcoincharts.com/markets/.
They are hiring like crazy and also on the development front quite a bit is happening with an iPhone app and a Java client library being released. (
https://github.com/ripple/)