Whether it's for your upcoming class, the subject line of your blog post/email, or your website, you need a hook.  That short, catchy phrase that grabs attention and keeps 'em reading.  Maybe we don't need to be as cheesy as the Weekly World News, but go ahead and get their attention!  Here are three basic formats for titles/headlines:
1.  How to __________________________.
2.  If you _________________, then _____________________.
3.  The ____ secrets to ________________________.
There are endless possibilities, for good structural ideas, check out magazine covers while you're waiting in line at the grocery store. Be enticing, be detailed (ex. 'How to Double Your Mailing List in 1 Week'), and have fun!