Although currently I spend most of my time on WSPR or other digital modes (saves my voice - stroke) here is a list of QRP calling frequencies which may be useful.
See http://www.njqrp.org/data/qrp_freqs.html . It shows European frequencies as well as USA ones.
My usual technique with QRP is "listen and pounce". I rarely call CQ on QRP and find this the more successful approach. Often the other station has no idea I am using very low power.