It seems like everyone has a blog these days, and a few of the lucky ones hear, "You really ought to write a book someday." If your friends are encouraging you to get published, rather than write all new content just use BlogBooker to export all your blog posts to book format and publish it yourself.
Built with open source tools, Blogbooker culls all the posts from your WordPress, Blogger, or LiveJournal blog and generates a high-quality PDF that you can print or send to a Publish On Demand (POD) publisher like Lulu or Cafe Press. Alternatively, you can print your book with a laser or inkjet printer, design a cover, then have it bound for you at a local bookbinder.
To create a book, simply supply your export file and the URL of your blog and BlogBooker takes care of the rest. Using FOSS tools like ImageMagik, pdfTeX, Lynx, and an open source pdf encryption toolkit, BlogBooker only stores your data for a short while before erasing it completely. According to the FAQ, "All files received, processed and sent are erased from the system within 12 hours. Most of the time, all files are erased few minutes after the end of process."
BlogBooker is a free service, however its developer happily accepts donations to help offset the cost of future development.