While Iron Man's popularity has grown thanks to the movies, he's far from being as popular as Spider-Man...
Though Iron Man was one of the first to make it on TV back in 1966 along with Cap, Thor, Hulk & the Submariner in the MMMS cartoons, which only lasted one season... Spidey then made his TV debut in 1967 with his own cartoon lasting until 1970.
Spidey then appeared as a live action character on The Electric Company from 1974 to 1977, and also had his own TV show called The Amazing Spider-Man, starring Nicholas Hammond... Spidey then had TWO cartoons in 1981, Spider-Man, as well as Spider-Man and His Amazing Friends... the former only lasting one season and the latter having two seasons.
After a 28 year hiatus on TV, Iron Man appears in the aptly named Iron Man cartoon in 1994, lasting 2 season, as well as Spider-Man:TAS, which lasted 4 seasons (I think)... which was followed by Spider-Man Unlimited in 1999, and at the same time, Iron Man made a few appearances in the Avengers: United We Stand cartoon... he was not a regular as that cartoon focused more on the West Coast Avengers comic line up from the mid 80's...
After the full length Spider-Man movie that took the world by storm in 2002, there was the forgettable Spider-Man: the New Animated Series in 2003, Spider-Man 2 in 2004, followed by Spider-Man 3 in 2007... the cartoon Spectacular Spider-Man hit the TV airwaves in 2008, lasting 2 seasons...
In 2008, we had the lovely Iron Man live action movie that blew everyone out of the water, followed by the Iron Man: Armored Adventures cartoon in 2009 that continues to this day, and Iron Man 2 in 2010. Iron Man also appears in Avengers: Earth's mightiest Heroes cartoon, and obviously, he appeared in the 2012 blockbuster movie, the Avengers.
In 2012, the Ultimate Spider-Man cartoon began, which is still on the air, and coming up this summer is the reboot to the Spidey films... The
Ultimate Amazing Spider-Man
Both heroes have been very prominent to the general public over the last 10 years, but I've been seeing Spidey's face plastered all over my school supplies since the early 70's... so while Iron Man's popularity may be growing, he still has a ways to catch up to Spidey.