Microlensing suggests at least one planet per star in the Milky Way

ESO News Release: eso1204: Planet Population Is Plentiful

Also contains a version of the Nature paper: One or more bound planets per Milky Way star from microlensing observations

From statistical analysis of microlensing data from 2002-2007, the planet abundances within 0.5-10 AU, broken down by mass range:

Jupiters (0.3-10 M_J): 17⁺⁶_-9%
Neptunes (10-30 M_⊕): 52⁺²²_-29%
Super-Earths (5-10 M_⊕): 62⁺³⁵_-37%

And here it is on arXiv.
http://arxiv.org/abs/1202.0903