I wanted to expand this conversation that was happening elsewhere. I've found sometimes it's something amazingly simply that changes everything. For my DS1, it was finding small pencils (golf/Argos size) that transformed his writing. With DD1, I found a website with the wide ruled dotted line paper which meant she could practice her writing as much as she wanted rather than waiting to get the notepads (which were only available at one shop in town and were quite pricey).
Now, I'm looking through products to help with geography. My DS1 loves staring and playing with maps, and I've been frustrated with how dull geography books for his age (7) are -- and as a non-Brit, I could use help learning British geography myself. Also looking for good (rather than patronising or convoluted) stories to show as examples as why certain activities are good or bad, though the Philosophy for Children website has been a great start for us on this.
So what magic have you found and what are looking for?