What photography kit should I purchase?

I'm going travelling around Europe for a fair while this summer, and currently have a Nikon D90 with a 18-105mm lens and a tripod. I've been taking photos for just shy of a year now and have taken some really great shots and love experimenting with all the different components, but I know very little about... show more I'm going travelling around Europe for a fair while this summer, and currently have a Nikon D90 with a 18-105mm lens and a tripod. I've been taking photos for just shy of a year now and have taken some really great shots and love experimenting with all the different components, but I know very little about the extra options out there, for example filter and other lenses etc. Does anyone have any tips on what to buy and why?

Many thanks
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