Congratulations Richard!
Not having any of my own kids but from working in a school where I have 26 kids in a class. I'd suggest:
Take as many photos when they are little - they grow up so fast!
Get some video of them doing the firsts - first steps, first spoonfull of food to reach the mouth etc! This is just so you can show them the film and embarass them when they are older!
Get some of the toys you always wanted as a kid yourself!
Get them into making things when they are little - that way they hopefully wont grow up fixed to a video game and unable to survive without a computer screen!
