Yesterday, I ran a quick poll on Twitter asking people about their favorite rounded sans serif fonts. I got a lot of great recommendations. Here's the most popular ones.
By a wide margin, the most popular choices were Gotham Rounded and VAG Rounded. Surprisingly (to me at least), Helvetica Rounded never came up. Update: Chris Palmieri pointed out Helvetica Rounded has a bulging effect that looks childish, and there are only a few weights.
Gotham Rounded: Gotham Rounded is a technical letter that goes from friendly to high-tech to cheeky with ease.
VAG Rounded: Developed for Volkswagen AG in 1979, VAG Rounded is a variation on nineteenth-century grotesque sans serif designs.
Calibri: The Calibri Font Family is part of the modern sans serif family with subtle roundings on stems and corners.
Bryant: The mechanical lettering kits used by draftsmen and amateur sign makers served as the inspiration for the Bryant family of typefaces. Update: Chris Palmieri let me know he's worked with Bryant for years: "it's nice in all caps, and the condensed sets very legibly for extended text."
FF DIN Round: Designed by Albert-Jan Pool in 2010.
Tondo Font Family by Dalton Maag