My most visited small subverse would definitely be /v/mealtimevideos. It's a sub for sharing videos that are long enough to last your entire meal.
I'd like for /v/hiphopheads to be more active. On Reddit, it's a really great sub with great mods. I hope we'll be able to replicate or even approve upon it here.
[–] dtch ago
/v/jeep and /v/nixers - the latter is essentially /r/unixporn