... does technolgy lead the products, or the products lead the technology?
Maybe, as most things in life, the answer isn't simply one or the other, but a combination of both and other factors (yes, there are no simple answers).
How often is a product generated from the desire to see a new technology in action? Where do all the blogs come from - is this led by the ability to host/publish blogs in different ways - built into many technologies; or is the desire to blog pushing the appearance of such technologies?
Well, there's the initial blog appearance - based on non-appealing software, then the idea of a market opporunity seized by the entrepreneur, then the sheep stampede of bloggers which follow, and then the more-blog software avalanche.
It's a symbiosis, not a horse and cart, bud!
