I love the kit lens that came with the D40, but I am wishing that I had a lens specific for macro work now.  Of course, when I look at the price for some of them... this is going to be an expensive hobby... I can tell already.  My neighbor, who is also a triathlete, joked with me when I bought my road bike that I would immediately want a new one as soon as I went into transition with it.  It wasn't that it's a bad bike (I love my bike), but rather that you can't help but feel bike envy.  As it turns out, you suffer the same in photography.  You get lens lust.  Anyway, here are some of my latest macro shots.  As always, you can click on any of them for a larger version.

I have more, which you can see in my set dedicated to macro flower shots.