Swedish is very similar to Norwegian and Danish, but while I can quite easily understand both spoken and written Norwegian there's no way I can understand spoken Danish! And then I'm still from the southern parts of Sweden, born in a city that's 20 minutes from Denmark if you step on a ferry. It's just so... Slurry...
Another language I sorta understand is Finnish, and that's 'cos both my parents are Finns. (I'm born here in Sweden though.) My papa and all my relatives (except my aunt) lives in various parts of south Finland, and I visit them relatively often. I understand some important words (such as "suklaa" and "jäätelö"
As for Italian, well, I'm (hopefully) going to work as a volunteer during the Winter Olympics in Torino, so I decided I needed to learn at least a bit of Italiano. I've only had a few lessons so far, but my teacher, Luigi, is great and I feel like I'm learning pretty fast. (I feel like I'm already ahead of the other people in my group even though they've had a few more lessons, but then again I'm better at Swedish then some of them too...)
I've taken french lessons too. Three years, didn't learn a squat. Prolly 'cos I didn't give a squat...