[bobthecockroach]

Places to buy CDs
Blast Beats - CD shop for heavy music: great collection, favorite store of many christian metalheads
ChristianBook.com
Christian Discs - Reliable, cheap, fast (international) delivery
Family Christian Stores - Large reliable company. Generally good prices and large selection.
Fresh Releases - Helpful and easy to navigate site layout.
Grassroots Music - Limited selection but great prices. Lots of indie bands.
MusiChristian - Reliable, cheap, fast (international) delivery

News and reviews
CM Central - Good amount of biographies on artists. Granted, it mostly covers pop CCM, but there's a good amount of rock related news and such that come out from there.
Jesus Freak Hideout - They have a growing artist database, and a rather extensive amount of CD reviews.

Artist Merch
CCM Tees - Quite a few popular artists use this as their online merch store.
Merch Plaza
Zambooie - They have a great selection of rock artists, and not full of CCM pop stuff.