This a collection of stories all taking place in Ms. Baker's universe built around The Company.  I think you could pick up this book and get into it even if you haven't read any of The Company novels.  Most of these stories have appeared elsewhere, in collections or monthly publications and are sort of introduced for those who don't know the details of her elaborate universe.  These stories focus more on the beloved side characters, or on possible historical events involving Company operatives.

I hesitate to describe this universe as amazing as I fear retribution from Timmy Mac, as he hates the overuse of that word, but man, it is awe inducing what Baker has produced over the last decade.  The characters, the research the world building and all.  I highly, highly recommend her series and as I mentioned, you could use this book of short stories as good jumping point, although the novels really should be read in published order.