@ossobuco,
The langos definitely aren't sweet! They're deep fried dough, basically, with a bit of garlic oil spread on top, or alternatively / additionally, sour cream and cheese - that's the best combination. But you can get them with just sour cream too or with other stuff, even sausage (?!).
Langos are great. Surprisingly, they're quite hard to get in Budapest, downtown at least - but no festival, sunday in a park, daytrip destination or provincial riverside boardwalk is complete without a langos seller. I guess they're kind of proletarian and that's why they were hard to find in downtown Pest .. but now a langos place has opened next to the Instant courtyard cafe, for that late-night liquor-fuelled hunger.
EDIT: Sajtos tejfölös lángos