Argh, stop it. I'm building myself my first new bike for a long time - I've got the tubing laid out, the dropouts and braze ons, the design mostly sorted, and I was going to make it 26" because that's what I've always ridden. Then people convinced me it had to be 29" - you'll never look back, I was told, it's so much better.
Now, apparently, this new size which is almost 26" is the answer.
If someone invents a new wheel size next week, when I'm half-way through building this frame, I'm going to be very, very cross.