In 2010, the top rising pronunciation search on YouTube was for Ke$ha. If you look at the data for Google in general, the top rising searches for pronunciations over the last few years were for acai (2009) Icelandic volcano eyjafjallajokull (2010) and, so far in 2011, new zodiac sign ophiuchus.
YouTube channel Pronunciationbook, which created the above video and roughly 350 others, has seen its views grow steadily over the past year, and drew some attention from pop-culture sites this week. "Ke$sha is one of their most popular, with over 100,00 views. The only others to draw more interest were Hermès, Acai, Louboutin, and L'OCCITANE.
Of course, there are lots of comedic videos tied to pronouncing things properly (or improperly) as well, like this clip from around this year's Super Bowl: