Here is the home of USB2SDR
and you can find support for the companion application PowerSDR-IQ
PowerSDR-IQ is a freeware Software Defined Radio application for homebrew SDR transceiver designs.
Based on FlexRadio™ PowerSDR™ SVN, is including modifications to support homebrew SDR designs, kits, projects and various interfaces (LPT,USB, Microchip etc) to control them.
Here we can exchange ideas and help each other on the challenge of hardware and software integration of Amateur Radio and SDR.
For information have a look at the links section where a collection of valuable setup guides, hints, tips and operation assistance, exists.
Oct 15, 2008 : Downloads and SVN