Sample this Music blog. Reminiscent of Pretty Lights,who gives his music away for free too, it sounds like they've done a lot of organic sampling to get that really listenable, feel good, 'real music' vibe. People's Radio is music that's worth paying for, but you can download it for free here.
Archnemesis - Peoples Radio by PlayThisSongLoud.com
Nastynasty has a well established habit of giving away his best tunes for nothing. The Memorabilia EP is a good taster of the range of his sounds, from floaty subs to bubbling bass and off kilter funk, often lifted with deliciously soulful vocals.