F-Spot
26 Oct 2005F-Spot is a photo management/cataloguing thing from the Gnome project that looks cool. Another reason to love Gnome! Note particularly the cool timeline thing in the screenshot on their site. I don’t know if I’ll start using it yet, but it looks cool. Assuming I don’t eventually wind up on iPhoto, this is probably going to become a mainstay of my day-to-day computing life if development on it continues (and I don’t see why it wouldn’t).
Obligatory geek aside: Look, it’s written in C# and uses Mono! (yeah, I realise I’m linking to my own comment. Not just a vanity trip, it is actually relevant!)