I'm an IndyCar nut... always have been from back in CART days. My first race I can REALLY remember (though I watched before that) was the '89 (I think?) Indianapolis 500 where Emerson Fittipaldi and Little Al touched in the last laps, sending Al Jr. into the wall. My grandmother got me into racing, of all people! I attended the 100th running last year, and if it wasn't for my daughter graduating the night before, I'd be going to #102, as well. She's lucky I kinda like her...
I've been an off-and-on fan of F1 for forever, as well. Most of the "off" was because, as said, it was hard to find and follow in the USA. It's got some great coverage now, though, on NBC families, and next season will be on ESPN. F1 has pretty much always been a few top teams on the podium every circuit -- it's just the teams that rotate at the top. It used to be Williams and Benetton, then Ferrari with Michael Schumacher and Alonso, Red Bull after that, and now Mercedes. I don't know what it is I love about F1 (though I love all sorts of motor/moto racing), but I've really been engrossed in it the last few seasons. One of my biggest regrets with living in Europe is not getting to a race. It was so damn expensive, though! Formula 1 is a rich man's game on both sides of the paddock.