Two of her theological series at "Rebecca Writes" are especially worth noting:
* The Purposes of Christ's Death. To access the posts, you can either follow the links on her sidebar, or you can start with the summary. Read Part I first, then use the links in Part II.
* The Attributes of God. To access the posts, begin here.
Both are a delightful crash course in the theological basics of certain aspects of the Christian faith and how those basics affect how we Christians should live our lives.
Some interesting recent posts, in no particular order:
* Isaiah 10 and Reconciling Friends
* Say What?? (on the 'descended into hell' article of the Apostles' Creed)
* Grace
* What to Do When Someone You Know Dies
And a quick sample from "David Brainerd's Blog":
* Letter III (Jan 21, 1743-44)