The D40 appreciation group. Yes, I love mine too. I've just bought a great, but expensive, lens for mine - the Nikon 18-200mm vr (£420 on ebay). I wanted a telephoto lens that would extend up to 200mm or 300mm somewhere and seriously considered buying the more expensive Nikon D80 because it can autofocus older lenses. But, I thought, do I want to part with the D40, and the answer was no. The D40 can autofocus on this amazing lens - so always remember that you don't neccesarily have to part with your D40 if you want to to go telephoto.
Tabletop tripod?! Velbon do small tripods for £20 or so. They're OK for the price. However, I've found that I feel safer with a larger tripod, because although the D40 isn't a big camera, it's still big enough to easily overbalance a small and light tripod, especially if you buy a bigger lens. Manfrotto do fairly portable tripods for £70 or so, like the 728. They also do the cheaper "Modo Mini 785SHB", which could probably fit in a rucksack. Hope this helps.