One of our favorites too--the 2010 CMO's guide to social media debuted in February's Issue #67. This quick hit guide helps marketers understand how to best leverage the major social media sites for customer communication, brand exposure, site traffic and SEO.

Whether it's a coupon website or a free song, Hot Sheet readers love deals. It's no surprise that our 500 free songs from Amazon entry is the most popular item of the last 99 issues.

PitchEngine was hot news for our readers back in 2008 with a platform that allowed press releases to be released into the welcoming arms of social networks.

Hot Sheet readers love tips and tricks that allow them to quickly review the success of their own interactive marketing efforts. This gem from January 2010 allows readers to determine if important parts of their web page are visible by a wide audience.

Rounding out the top five is one of our latest Hot Sheet contenders from October 2010, in one of our most popular topic categories --mobile. Keep an eye on mobile micropayments; we think it's going to be big.