On November 17th I seem to blog more than usual.
So a few months ago I installed the A Year Ago Today plug-in it shows a list of posts that I’ve done on this day (date) in the past at the top of my blog. 
I’ve liked it a lot, it reminds me of things I’ve done in the past so I generally revisit the posts. Sometimes I barely even remember blogging it. And sometimes it generates new traffic to the posts (most times not).
I think today is the first day that not only has there been a post from each of the year’s that I’ve been blogging but there were exactly two (2) posts from each November 17 for the last five years.
This helps me clean up my blog too: I’ll occasionally fix some links or add some tags and categories or sometimes fix something minor. Some of the categories I use now, didn’t exist when I wrote some of the earlier posts and I use tags the first few years. This results in things getting reposted to Facebook (via WordBook), generally I’ll delete them but sometimes I’ll leave them (if it’s got a photo or isn’t time sensitive). Occasionally, I’ll read a sentence and think “that makes no sense” so I’ll fix it, I try not to do this too much, it’s really about what I was thinking/feeling/doing then, but if it’s not clear it needs fixing…
Also see these (similar) items:
That seems like a cool idea – I love having my blog just so I do remember what I was doing, thinking, feeling in the past.