We’ve got you covered.
Here’s a very detailed article from WPMU on various tactics and options.
Even if you’re running a private blog, your file attachments aren’t as secure as you might like. Your or your users can innocently copy-and-paste a link to a PDF file into an e-mail … which gets passed around … then somebody puts it in a Twitter or Facebook post … and before you know it the file you wanted to keep just for your selected audience has been indexed by Google!
Everyone’s going mobile — are you ready?
TablePress, Polldaddy Polls & Ratings, WP Twitter AutoPost and Microblog Poster.