Definitely let it compost. I've experimented with using chicken litter that hasn't aged, and it literally killed my plants. Moreover, the area I added the litter to refused to allow anything to grow at all. A year later, that spot finally grew weeds and I knew it was ready for use!
Pile that litter somewhere and do add other material to it to help the composting process. Grass clippings, leaves, the usual. Next year it'll be a really good addition for your garden.
