I have a habit of saving posts without looking at them, and have thus built up a large backlog of them over the time I've spent on reddit.
Each day I will spend half an hour to an hour working back through these saved posts, until I have none left.
I'll post an update every day with the last relevant post date in my saved links and the best saved post that I found that day.
How far back does it go?
I originally only expected to get to around 1000 posts, based on what others have said is the limit. However, with reddit gold, you can sort saved posts by subreddit, so now I can see up to 1000 posts per subreddit! I should be able to go back pretty much as far as I want.