Although I only dabble in Twitter and seem to go through periods of on again/off-again posting to Tumblr, I know that many social media denizens are addicted to several microblogging tools. If you're one of these, then you might want to check out HelloTxt, which allows you to post to Twitter, Pownce, Jaiku, Facebook, Plaxo, Tumblr and several other microblog sites with a single click. But, as Aliza Sherman points out, use the service thoughtfully, as you could come across as a spammer if you post out of context to the conversations going on.