I recommend it all the time to everyone who's looking for something out of the ordinary and intelligent for kiddos –it's US-based, so the links tend to take you to US sites, but you can usually find the gifts themselves in the UK too.
It's the The Kid Should See This Gift Guide , created by the makers of The Kid Should See This, which is also very cool.
Categories at the top, or you can just scroll and look at everything. Seems a little book-heavy right now, but it's often updated.
It's a tumblr, so you have to keep scrolling down and it sometimes takes a second to load, but it's also Freaking Awesome for inspiration or just a good browse.
I find myself linking to it all the blimmin' time, so I thought I'd stick it in its own thread and be done wiht it 