I'm also in the market for my first DSLR.
I ended up going with Nikon when I handled the D60 and took a few shots at my local camera shop. I guess it just FEELS different for me. I learned about exposure, aperture, and shutter speed on my dad's old Nikon film body when I was in middle school I'm sure it had it's effect as well.
I'm still kind of on the edge between the D60, D90, and the D5000. I, like others on this forum, would LOVE a D1000 (or something) that's the size of the D60, but with the innards of the D5000. But, I know it's pretty unlikely so that's fine. I'm leaning towards the D5000 because of the smaller size (compared to the D90) and D90 sensor it inherited. I think it's worth the couple hundred extra over the D60.
But it's all in the lens right? It seems to be the main lesson I've been learning in all these forums.
What a world I'm walking into.