Happy Leap Day, earthlings! Does anyone else find this day kind of creepy? I’m actually getting on a plane to Chicago later, and I’m a little worried that maybe we’ll fly into a wormhole and I’ll end up on the other side of a black hole. I don’t know, my physics is a little fuzzy. I just know Leap Years are weird. (And did you know there are leap seconds [6] too? The next one is coming in June 2012. Watch out! No pun intended.)

Since the universe has given us a whole extra day this year, why  not use it to catch up on your reading, hm? Here are our greatest can’t-miss hits from the past month:

1. 5 Blog Redesign Mistakes That Kill SEO [7] – This guest post from our friends at Boxcar Marketing reveals some common gotchas that can make a site redesign more painful that it needs to be. Don’t get caught with your pants (or your links) down!
2. 7 Examples of Awesomely Creative Advertising: Using Your Environment [8] – Meg put together this great list of innovative advertising strategies like “seed bombing” and “reverse graffiti.” (Recent tweet [9] I saw in my stream: Innovation used to mean “we used slide rules to make a rocket that went to the moon.” Now it's “look...ads!”)
3. Google AdWords Basics: 5 Things to Get Right First [10] – It’s all well and good to screw around with dayparting and geo-targeting – but before you  get too involved in such advanced tactics, make sure you’ve mastered these five campaign basics.
4. Are You Making These 3 Pay-Per-Click Advertising Mistakes? [11] – If so, you’re either leaving money on the table or paying way more than you need to.
5. Crushing on Love Letters: A Valentine's Day Case Study in User Engagement [12] – Meg is one of many avid fans of the Love Letters column in the Boston Globe. In this post, she takes a look at why Meredith Goldstein’s column is so popular with readers – who comment like crazy.
6. AdWords Blogging Mania! Our Best Google AdWords Blog Posts of All Time [13] – Check out our top 10 most popular articles about Google AdWords.
7. What Is an AdWords Audience? [14] – Learn how to use the AdWords audience tab to improve targeting in your display campaigns.
8. The Overworked Advertiser's Guide to AdWords Bid Management [15] – Ain’t got time to mess with bids? Here’s a bid management strategy that works if you’ve got minimal time and money to spare.
9. Introducing Enhanced Ad Sitelinks: The War on SEO Wages On [16] – Larry muses on Google’s latest move to make SEO harder (and PPC comparatively more important).
10. Keyword Not Provided – What Is the esrc=s String in Google Analytics? [17] – As for this month, about 30% of our organic search traffic is obfuscated by Google. NO FAIR!