If you're looking to build your jazz collection, this site offers some sound guidance. It features 100 top jazz CDs. Although inherently subjective, the list includes many indisputable classics that belong in any respectable jazz collection. (Note: if you click on the link for each album, you'll find some background information that's often worth reading.)
For more jazz, check out our collection of Music Podcasts which includes a decent selection of, yes, jazz podcasts.