You can use these same techniques for other sites too, and I'll let others respond in the comments with their favorites.
Once you're syndicating your projects, you might want to follow the featured or recent Instructables on Twitter or Facebook.
Step 1: Find Your Instructables RSS Feeds
Step 2: Twitterfeed
Step 3: RSS Mix
You can also link your Twitter account -- with Instructables activity through Twitterfeed -- to Facebook for status updates. On Facebook, I have all my Instructables activity syndicated both through Twitter and through Blog/RSS Notes. I find that some people just follows status updates, while others want the additional information available in the full-text of a note.