If you've been blogging for awhile, you have lots of great content to pull from to make a presentation deck for "lunch-and-learn" types of speaking engagements. You can also create the "decks" to share on SlideShare or individual slides on Flickr by using an image and the Post Headline or "money quote" within a post.
Once you've repurposed the content for use online, contact your local chambers of commerce, and other professional development associations to ask if they are looking for speakers. Just 10-20 slides will give you a great foundation for a presentation — and who knows, you may just kick-off a side source of income speaking, or better yet, create a new customer base — all by repurposing content already published on your blog.
I recently did this exercise and forgot that I had written a series on "Fears of Blogging" several years ago. I'm turning that into a new slide deck and presentation.
One other thing you can do with your archives, especially if you've been blogging since pre-Twitter days, is to share those archives occasionally on Twitter – maybe with a "From the Archives" within the tweet.
Give it a shot. Let me know how it works out for you.